MediumCVE-2021-1379

    Cisco IP Phones with Multiplatform Firmware: Classic Buffer Overflow (CVE-2021-1379)

    Published Sources: CVE.org

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    What is affected, what to do

    Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)..11.0(3)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(4)SR2 3rd Party..9.3(4)SR2 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR1..10.3(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR3..10.3(1)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 10.1(1)SR1..10.1(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 12.0(1)SR3..12.0(1)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 12.6(1)SR1..12.6(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 12.7(1)..12.7(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR6..10.3(1)SR6
    • Cisco Session Initiation Protocol (SIP) Software eq 12.8(1)..12.8(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 12.7(1)SR1..12.7(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(2)SR1..11.0(2)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(4)..11.0(4)
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(2)..11.0(2)
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(4)SR3..11.0(4)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(5)..11.0(5)
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR2..11.0(3)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR4..11.0(3)SR4
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR3..11.0(3)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(2)SR2..11.0(2)SR2
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.2..11.1.2
    • Cisco IP Phones with Multiplatform Firmware eq 11.2.1..11.2.1
    • Cisco IP Phones with Multiplatform Firmware eq 11.2.3..11.2.3
    • Cisco IP Phones with Multiplatform Firmware eq 11.2.2..11.2.2
    • Cisco IP Phones with Multiplatform Firmware eq 11.2.3 MSR1-1..11.2.3 MSR1-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.2 MSR1-1..11.1.2 MSR1-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.1..11.1.1
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.2 MSR3-1..11.1.2 MSR3-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.0.0..11.0.0
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.1 MSR1-1..11.1.1 MSR1-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.0.1..11.0.1
    • Cisco IP Phones with Multiplatform Firmware eq 11.1.1 MSR2-1..11.1.1 MSR2-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.2.4..11.2.4
    • Cisco IP Phones with Multiplatform Firmware eq 11.0.1 MSR1-1..11.0.1 MSR1-1
    • Cisco IP Phones with Multiplatform Firmware eq 11.0.2..11.0.2
    • Cisco IP Phones with Multiplatform Firmware eq 11.3.1..11.3.1
    • Cisco IP Phones with Multiplatform Firmware eq 11.3.1 MSR1-3..11.3.1 MSR1-3
    • Cisco IP Phones with Multiplatform Firmware eq 11.3.2..11.3.2
    • Cisco IP Phones with Multiplatform Firmware eq 11.3.1 MSR2-6..11.3.1 MSR2-6
    • Cisco IP Phones with Multiplatform Firmware eq 11.3.1 MSR3-3..11.3.1 MSR3-3
    • Cisco Session Initiation Protocol (SIP) Software eq 9.0(3)..9.0(3)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.0(2)SR2..9.0(2)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 9.0(2)SR1..9.0(2)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 9.2(1)..9.2(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.4(2)SR1..9.4(2)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 9.4(2)..9.4(2)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.4(2)SR2..9.4(2)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 9.4(2)SR3..9.4(2)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(1)SR2..9.3(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(1)SR3..9.3(1)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(1)SR1..9.3(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 9.1(1)SR1..9.1(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(1)SR4..9.3(1)SR4
    • Cisco Session Initiation Protocol (SIP) Software eq 9.2(3)..9.2(3)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.2(1)SR2..9.2(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(1)..9.3(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 9.4(2)SR4..9.4(2)SR4
    • Cisco Session Initiation Protocol (SIP) Software eq 12.1(1)SR1..12.1(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.5(1)..11.5(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(2)..10.3(2)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.2(2)..10.2(2)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)..10.3(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR4..10.3(1)SR4
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(1)..11.0(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.4(1)SR2 3rd Party..10.4(1)SR2 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 11.7(1)..11.7(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 12.1(1)..12.1(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(0.7) MPP..11.0(0.7) MPP
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(4) 3rd Party..9.3(4) 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 12.5(1)SR2..12.5(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 10.2(1)SR1..10.2(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(4)SR1..11.0(4)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(5)SR3..11.0(5)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(4)SR3 3rd Party..9.3(4)SR3 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 10.2(1)..10.2(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 12.5(1)..12.5(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR2..10.3(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 11-0-1MSR1-1..11-0-1MSR1-1
    • Cisco Session Initiation Protocol (SIP) Software eq 10.4(1) 3rd Party..10.4(1) 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 12.5(1)SR1..12.5(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.5(1)SR1..11.5(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 10.1(1)SR2..10.1(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 12.0(1)SR2..12.0(1)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 12.6(1)..12.6(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1.11) 3rd Party..10.3(1.11) 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 12.0(1)..12.0(1)
    • Cisco Session Initiation Protocol (SIP) Software eq 12.0(1)SR1..12.0(1)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(3)..9.3(3)
    • Cisco Session Initiation Protocol (SIP) Software eq 12.5(1)SR3..12.5(1)SR3
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR4b..10.3(1)SR4b
    • Cisco Session Initiation Protocol (SIP) Software eq 9.3(4)SR1 3rd Party..9.3(4)SR1 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1)SR5..10.3(1)SR5
    • Cisco Session Initiation Protocol (SIP) Software eq 10.1(1.9)..10.1(1.9)
    • Cisco Session Initiation Protocol (SIP) Software eq 10.3(1.9) 3rd Party..10.3(1.9) 3rd Party
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(5)SR2..11.0(5)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR6..11.0(3)SR6
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(5)SR1..11.0(5)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(4)SR2..11.0(4)SR2
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR1..11.0(3)SR1
    • Cisco Session Initiation Protocol (SIP) Software eq 11.0(3)SR5..11.0(3)SR5
    • Cisco Small Business IP Phones eq 7.4.8..7.4.8
    • Cisco Small Business IP Phones eq 7.4.3..7.4.3
    • Cisco Small Business IP Phones eq 7.5.5a..7.5.5a
    • Cisco Small Business IP Phones eq 7.3.7..7.3.7
    • Cisco Small Business IP Phones eq 7.5.2..7.5.2
    • Cisco Small Business IP Phones eq 7.5.1..7.5.1
    • Cisco Small Business IP Phones eq 7.4.6..7.4.6
    • Cisco Small Business IP Phones eq 7.5.7..7.5.7
    • Cisco Small Business IP Phones eq 7.4.4..7.4.4
    • Cisco Small Business IP Phones eq 7.6.2SR3..7.6.2SR3
    • Cisco Small Business IP Phones eq 7.6.2..7.6.2
    • Cisco Small Business IP Phones eq 7.5.6..7.5.6
    • Cisco Small Business IP Phones eq 7.5.6c..7.5.6c
    • Cisco Small Business IP Phones eq 7.6.0..7.6.0
    • Cisco Small Business IP Phones eq 7.4.7..7.4.7
    • Cisco Small Business IP Phones eq 7.6.2SR6..7.6.2SR6
    • Cisco Small Business IP Phones eq 7.5.2b..7.5.2b
    • Cisco Small Business IP Phones eq 7.5.5..7.5.5
    • Cisco Small Business IP Phones eq 7.5.6a..7.5.6a
    • Cisco Small Business IP Phones eq 7.6.2SR2..7.6.2SR2
    • Cisco Small Business IP Phones eq 7.5.3..7.5.3
    • Cisco Small Business IP Phones eq 7.5.2a..7.5.2a
    • Cisco Small Business IP Phones eq 7.5.6(XU)..7.5.6(XU)
    • Cisco Small Business IP Phones eq 7.5.7s..7.5.7s
    • Cisco Small Business IP Phones eq 7.6.2SR4..7.6.2SR4
    • Cisco Small Business IP Phones eq 7.6.2SR1..7.6.2SR1
    • Cisco Small Business IP Phones eq 7.4.9..7.4.9
    • Cisco Small Business IP Phones eq 7.5.5b..7.5.5b
    • Cisco Small Business IP Phones eq 7.6.2SR5..7.6.2SR5
    • Cisco Small Business IP Phones eq 7.5.4..7.5.4
    • Cisco Small Business IP Phones eq 7.6.1..7.6.1
    • Cisco Small Business IP Phones eq 7.6.2SR7..7.6.2SR7

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    6.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    6.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: CVE.org

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 26.0

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    44.75 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    6.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    6.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.3 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    26.0
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 18 November 2024
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-120

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    Multiple vulnerabilities in the Cisco&nbsp;Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco&nbsp;IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco&nbsp;Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco&nbsp;Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.Note: Cisco&nbsp;Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).Cisco&nbsp;has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

    Source: NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    CiscoCisco IP Phones with Multiplatform Firmware
    • 11.3.1 MSR2-6
    • 11.0.0
    • 11.2.3 MSR1-1
    • 11.1.2 MSR3-1
    • 11.2.1
    • 11.1.1 MSR1-1
    • 11.2.4
    • 11.3.1 MSR1-3
    • 11.3.1 MSR3-3
    • 11.0.2
    • 11.0.1 MSR1-1
    • 11.2.2
    • 11.1.2
    • 11.3.1
    • 11.1.1
    • 11.1.2 MSR1-1
    • 11.3.2
    • 11.2.3
    • 11.1.1 MSR2-1
    • 11.0.1
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    CiscoCisco Session Initiation Protocol (SIP) Software
    • 10.3(1)SR5
    • 12.8(1)
    • 11.0(3)SR2
    • 10.3(1.9) 3rd Party
    • 9.4(2)SR2
    • 10.3(1)SR3
    • 9.3(4)SR3 3rd Party
    • 9.3(1)SR2
    • 9.3(4) 3rd Party
    • 10.1(1)SR1
    • 12.5(1)
    • 9.3(1)SR1
    • 11.0(5)SR3
    • 9.3(3)
    • 12.1(1)
    • 9.3(4)SR2 3rd Party
    • 11.0(5)SR1
    • 10.4(1) 3rd Party
    • 9.0(3)
    • 10.3(1)SR2
    • 11.0(4)SR2
    • 11.0(3)SR5
    • 9.0(2)SR1
    • 9.3(4)SR1 3rd Party
    • 9.1(1)SR1
    • 12.7(1)
    • 11.7(1)
    • 11.0(5)SR2
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    Vendors and products

    Affected operating systems

    Affected operating systems
    Otherciscoip_conference_phone_7832_firmware12.8\(1\)
    Otherciscoip_conference_phone_7832_firmware—
    Otherciscoip_conference_phone_7832_with_multiplatform_firmware—
    Otherciscoip_conference_phone_8832_firmware12.8\(1\)
    Otherciscoip_conference_phone_8832_firmware—
    Otherciscoip_conference_phone_8832_with_multiplatform_firmware—
    Otherciscoip_phone_6821_with_multiplatform_firmware—
    Otherciscoip_phone_6841_with_multiplatform_firmware—
    Otherciscoip_phone_6851_with_multiplatform_firmware—
    Otherciscoip_phone_6861_with_multiplatform_firmware—
    Otherciscoip_phone_6871_with_multiplatform_firmware—
    Otherciscoip_phone_7811_firmware12.8\(1\)
    Otherciscoip_phone_7811_firmware—
    Otherciscoip_phone_7811_with_multiplatform_firmware—
    Otherciscoip_phone_7821_firmware12.8\(1\)
    Otherciscoip_phone_7821_firmware—
    Otherciscoip_phone_7821_with_multiplatform_firmware—
    Otherciscoip_phone_7841_firmware12.8\(1\)
    Otherciscoip_phone_7841_firmware—
    Otherciscoip_phone_7841_with_multiplatform_firmware—
    Otherciscoip_phone_7861_firmware12.8\(1\)
    Otherciscoip_phone_7861_firmware—
    Otherciscoip_phone_7861_with_multiplatform_firmware—
    Otherciscoip_phone_8811_firmware12.8\(1\)

    Weakness classes (CWE)

    • CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

      Base

      The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

      Entry at MITRE CWE-120

    References & sources

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