Cisco Secure Access Control Server (ACS) 5.5(0.46.2): Denial of Service (CVE-2005-0356)
Published Sources: CVE.org
What is affected, what to do
Multiple TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled allow remote attackers to cause a denial of service (connection loss) via a spoofed packet with a large timer value, which causes the host to discard later packets because they appear to be too old.
The available sources name no fixed version. Check the vendor guidance in the references below.
- Affected
- Cisco Emergency Responder 11.5(1.10000.4)
eq 1.1..1.1 - Cisco Intelligent Contact Manager 6.0(0)A(1)
eq 5.0..5.0 - Cisco Personal Assistant 1.3 (4)
eq 1.3\(1\)..1.3\(1\) - Cisco Personal Assistant 1.3 (4)
eq 1.3\(2\)..1.3\(2\) - Cisco Personal Assistant 1.3 (4)
eq 1.3\(3\)..1.3\(3\) - Cisco Personal Assistant 1.3 (4)
eq 1.3\(4\)..1.3\(4\) - Cisco Personal Assistant 1.3 (4)
eq 1.4\(1\)..1.4\(1\) - Cisco Personal Assistant 1.3 (4)
eq 1.4\(2\)..1.4\(2\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.0..2.0 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.1..2.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.3..2.3 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.3.5.1..2.3.5.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.3.6.1..2.3.6.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.4..2.4 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.5..2.5 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.6..2.6 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.6.2..2.6.2 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.6.3..2.6.3 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.6.4..2.6.4 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 2.42..2.42 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.0..3.0 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.0.1..3.0.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.0.3..3.0.3 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.1..3.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.1.1..3.1.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2..3.2 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2\(1\)..3.2\(1\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2\(1.20\)..3.2\(1.20\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2\(2\)..3.2\(2\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2\(3\)..3.2\(3\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2.1..3.2.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.2.2..3.2.2 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.3..3.3 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.3\(1\)..3.3\(1\) - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.3.1..3.3.1 - Cisco Secure Access Control Server (ACS) 5.5(0.46.2)
eq 3.3.2..3.3.2 - Hitachi Alaxala
eq ax..ax - Cisco Call Manager 4.3.1 SR1
eq 1.0..1.0 - Cisco Call Manager 4.3.1 SR1
eq 2.0..2.0 - Cisco Call Manager 4.3.1 SR1
eq 3.0..3.0 - Cisco Call Manager 4.3.1 SR1
eq 3.1..3.1 - Cisco Call Manager 4.3.1 SR1
eq 3.1\(2\)..3.1\(2\) - Cisco Call Manager 4.3.1 SR1
eq 3.1\(3a\)..3.1\(3a\) - Cisco Call Manager 4.3.1 SR1
eq 3.2..3.2 - Cisco Call Manager 4.3.1 SR1
eq 3.3..3.3 - Cisco Call Manager 4.3.1 SR1
eq 3.3\(3\)..3.3\(3\) - Cisco Call Manager 4.3.1 SR1
eq 4.0..4.0 - Cisco Unity Server
eq 2.0..2.0 - Cisco Unity Server
eq 2.1..2.1 - Cisco Unity Server
eq 2.2..2.2 - Cisco Unity Server
eq 2.3..2.3 - Cisco Unity Server
eq 2.4..2.4 - Cisco Unity Server
eq 2.46..2.46 - Cisco Unity Server
eq 3.0..3.0 - Cisco Unity Server
eq 3.1..3.1 - Cisco Unity Server
eq 3.2..3.2 - Cisco Unity Server
eq 3.3..3.3 - Cisco Unity Server
eq 4.0..4.0 - Cisco MGX 8230
eq 1.2.10..1.2.10 - Cisco MGX 8230
eq 1.2.11..1.2.11 - Cisco MGX 8250
eq 1.2.10..1.2.10 - Cisco MGX 8250
eq 1.2.11..1.2.11 - Cisco CiscoWorks Access Control List Manager
eq 1.5..1.5 - Cisco CiscoWorks Access Control List Manager
eq 1.6..1.6 - Cisco CiscoWorks Common Management Foundation
eq 2.0..2.0 - Cisco CiscoWorks Common Management Foundation
eq 2.1..2.1 - Cisco CiscoWorks Common Management Foundation
eq 2.2..2.2 - Cisco CiscoWorks Common Services
eq 2.2..2.2 - Cisco CiscoWorks LMS
eq 1.3..1.3 - Cisco Web NS (Networking Services) Software
eq 7.10_\(05.07\)s..7.10_\(05.07\)s - Cisco Web NS (Networking Services) Software
eq 7.20_\(03.09\)s..7.20_\(03.09\)s - Cisco Web NS (Networking Services) Software
eq 7.20_\(03.10\)s..7.20_\(03.10\)s - Cisco Web NS (Networking Services) Software
eq 7.30_\(00.08\)s..7.30_\(00.08\)s - Cisco Web NS (Networking Services) Software
eq 7.30_\(00.09\)s..7.30_\(00.09\)s - Nortel Business Communications Manager
eq 200..200 - Nortel Business Communications Manager
eq 400..400 - Nortel Business Communications Manager
eq 1000..1000 - Nortel CallPilot
eq 200i..200i - Nortel CallPilot
eq 201i..201i - Nortel CallPilot
eq 702t..702t - Nortel CallPilot
eq 703t..703t - Nortel SRG
eq 1.0..1.0 - Nortel Universal Signaling Point
eq 5200..5200 - Nortel Universal Signaling Point
eq compact_lite..compact_lite - Ciscoworks Cd1
eq 1st..1st - Ciscoworks Cd1
eq 2nd..2nd - Ciscoworks Cd1
eq 3rd..3rd - Ciscoworks Cd1
eq 4th..4th - Ciscoworks Cd1
eq 5th..5th - Cisco Conference Connection 1.1 (1)
eq 1.1\(1\)..1.1\(1\) - Cisco Conference Connection 1.1 (1)
eq 1.2..1.2 - FreeBSD
eq 1.1.5.1..1.1.5.1 - FreeBSD
eq 2.0..2.0 - FreeBSD
eq 2.0.5..2.0.5 - FreeBSD
eq 2.1.0..2.1.0 - FreeBSD
eq 2.1.5..2.1.5 - FreeBSD
eq 2.1.6..2.1.6 - FreeBSD
eq 2.1.6.1..2.1.6.1 - FreeBSD
eq 2.1.7.1..2.1.7.1 - FreeBSD
eq 2.2..2.2 - FreeBSD
eq 2.2.2..2.2.2 - FreeBSD
eq 2.2.3..2.2.3 - FreeBSD
eq 2.2.4..2.2.4 - FreeBSD
eq 2.2.5..2.2.5 - FreeBSD
eq 2.2.6..2.2.6 - FreeBSD
eq 2.2.8..2.2.8 - FreeBSD
eq 3.0..3.0 - FreeBSD
eq 3.1..3.1 - FreeBSD
eq 3.2..3.2 - FreeBSD
eq 3.3..3.3 - FreeBSD
eq 3.4..3.4 - FreeBSD
eq 3.5..3.5 - FreeBSD
eq 3.5.1..3.5.1 - FreeBSD
eq 4.0..4.0 - FreeBSD
eq 4.1..4.1 - FreeBSD
eq 4.1.1..4.1.1 - FreeBSD
eq 4.2..4.2 - FreeBSD
eq 4.3..4.3 - FreeBSD
eq 4.4..4.4 - FreeBSD
eq 4.5..4.5 - FreeBSD
eq 4.6..4.6 - FreeBSD
eq 4.6.2..4.6.2 - FreeBSD
eq 4.7..4.7 - FreeBSD
eq 4.8..4.8 - FreeBSD
eq 4.9..4.9 - FreeBSD
eq 4.10..4.10 - FreeBSD
eq 4.11..4.11 - FreeBSD
eq 5.0..5.0 - FreeBSD
eq 5.1..5.1 - FreeBSD
eq 5.2..5.2 - FreeBSD
eq 5.2.1..5.2.1 - FreeBSD
eq 5.3..5.3 - FreeBSD
eq 5.4..5.4 - Microsoft Windows 2003 Server R2 Service Pack 2
eq enterprise..enterprise - Microsoft Windows 2003 Server R2 Service Pack 2
eq enterprise_64-bit..enterprise_64-bit - Microsoft Windows 2003 Server R2 Service Pack 2
eq r2..r2 - Microsoft Windows 2003 Server R2 Service Pack 2
eq standard..standard - Microsoft Windows 2003 Server R2 Service Pack 2
eq standard_64-bit..standard_64-bit - Microsoft Windows 2003 Server R2 Service Pack 2
eq web..web - OpenBSD
eq 3.0..3.0 - OpenBSD
eq 3.1..3.1 - OpenBSD
eq 3.2..3.2 - OpenBSD
eq 3.3..3.3 - OpenBSD
eq 3.4..3.4 - OpenBSD
eq 3.5..3.5 - OpenBSD
eq 3.6..3.6 - Alaxala Networks
eq ax5400s..ax5400s - Alaxala Networks
eq ax7800r..ax7800r - Alaxala Networks
eq ax7800s..ax7800s - Cisco SN 5420 Storage Router Firmware
eq 1.1\(2\)..1.1\(2\) - Cisco SN 5420 Storage Router Firmware
eq 1.1\(3\)..1.1\(3\) - Cisco SN 5420 Storage Router Firmware
eq 1.1\(4\)..1.1\(4\) - Cisco SN 5420 Storage Router Firmware
eq 1.1\(5\)..1.1\(5\) - Cisco SN 5420 Storage Router Firmware
eq 1.1\(7\)..1.1\(7\) - Cisco SN 5420 Storage Router Firmware
eq 1.1.3..1.1.3 - Cisco SN 5428 Storage Router
eq 2-3.3.1-k9..2-3.3.1-k9 - Cisco SN 5428 Storage Router
eq 2-3.3.2-k9..2-3.3.2-k9 - Cisco SN 5428 Storage Router
eq 2.5.1-k9..2.5.1-k9 - Cisco SN 5428 Storage Router
eq 3.2.1-k9..3.2.1-k9 - Cisco SN 5428 Storage Router
eq 3.2.2-k9..3.2.2-k9 - Cisco SN 5428 Storage Router
eq 3.3.1-k9..3.3.1-k9 - Cisco SN 5428 Storage Router
eq 3.3.2-k9..3.3.2-k9 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.0..4.0 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.2..4.2 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.3..4.3 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.4..4.4 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5..4.5 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5.6..4.5.6 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5.9..4.5.9 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5.10..4.5.10 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5.11..4.5.11 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.5.12..4.5.12 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.6..4.6 - F5 Networks Traffic Management Operating System (TMOS)
eq 4.6.2..4.6.2 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0..9.0 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0.1..9.0.1 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0.2..9.0.2 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0.3..9.0.3 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0.4..9.0.4 - F5 Networks Traffic Management Operating System (TMOS)
eq 9.0.5..9.0.5
- Cisco Emergency Responder 11.5(1.10000.4)
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Metrics
—
Priority
No value is available for this vulnerability.
—
CVSS v3
No value is available for this vulnerability.
82.8 %
EPSS score
High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
Source: FIRST EPSS, percentile 99.67
Show all metrics
- Severity
- Not rated
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- 79.47 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
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- 82.8 %
- High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
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- 99.67
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
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
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 TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled allow remote attackers to cause a denial of service (connection loss) via a spoofed packet with a large timer value, which causes the host to discard later packets because they appear to be too old.
Source: cvelistv5, NVD (NIST)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| alaxala | alaxala_networks |
|
|
| cisco | agent_desktop |
|
|
| cisco | aironet_ap1200 |
|
|
| cisco | aironet_ap350 |
|
|
| cisco | call_manager |
|
|
| cisco | ciscoworks_access_control_list_manager |
|
|
| cisco | ciscoworks_common_management_foundation |
|
|
| cisco | ciscoworks_common_services |
|
|
| cisco | ciscoworks_lms |
|
|
| cisco | ciscoworks_vpn_security_management_solution |
|
|
| cisco | ciscoworks_windows |
|
|
| cisco | content_services_switch_11000 |
|
|
| cisco | content_services_switch_11050 |
|
|
| cisco | content_services_switch_11150 |
|
|
| cisco | content_services_switch_11500 |
|
|
| cisco | content_services_switch_11501 |
|
|
| cisco | content_services_switch_11503 |
|
|
| cisco | content_services_switch_11506 |
|
|
| cisco | content_services_switch_11800 |
|
|
| cisco | e-mail_manager |
|
|
| cisco | emergency_responder |
|
|
| cisco | intelligent_contact_manager |
|
|
| cisco | interactive_voice_response |
|
|
| cisco | ip_contact_center_enterprise |
|
|
| cisco | ip_contact_center_express |
|
|
| cisco | meetingplace |
|
|
| cisco | personal_assistant |
|
|
| cisco | remote_monitoring_suite_option |
|
|
| cisco | secure_access_control_server |
|
|
Vendors and products
- Cisco Cisco Aironet 1200
- Cisco Cisco Aironet Access Point 350
- Cisco Cisco Call Manager 4.3.1 SR1
- Cisco Ciscoworks Cd1
- Cisco Cisco CiscoWorks Common Management Foundation
- Cisco Cisco CiscoWorks Common Services
- Cisco Cisco Conference Connection 1.1 (1)
- Cisco Cisco Content Service 11000
- Cisco Cisco Cisco Content Services 11050
- Cisco Cisco Cisco Content Services 11150
- Cisco Cisco Content Service Switch 11500
- Cisco Cisco Cisco Content Services 11800
Affected operating systems
| BSD | freebsd | freebsd | 1.1.5.1 |
| BSD | freebsd | freebsd | 2.0 |
| BSD | freebsd | freebsd | 2.0.5 |
| BSD | freebsd | freebsd | 2.1.0 |
| BSD | freebsd | freebsd | 2.1.5 |
| BSD | freebsd | freebsd | 2.1.6 |
| BSD | freebsd | freebsd | 2.1.6.1 |
| BSD | freebsd | freebsd | 2.1.7.1 |
| BSD | freebsd | freebsd | 2.2 |
| BSD | freebsd | freebsd | 2.2.2 |
| BSD | freebsd | freebsd | 2.2.3 |
| BSD | freebsd | freebsd | 2.2.4 |
| BSD | freebsd | freebsd | 2.2.5 |
| BSD | freebsd | freebsd | 2.2.6 |
| BSD | freebsd | freebsd | 2.2.8 |
| BSD | freebsd | freebsd | 3.0 |
| BSD | freebsd | freebsd | 3.1 |
| BSD | freebsd | freebsd | 3.2 |
| BSD | freebsd | freebsd | 3.3 |
| BSD | freebsd | freebsd | 3.4 |
| BSD | freebsd | freebsd | 3.5 |
| BSD | freebsd | freebsd | 3.5.1 |
| BSD | freebsd | freebsd | 4.0 |
| BSD | freebsd | freebsd | 4.1 |
References & sources
- exchange.xforce.ibmcloud.comtcp-ip-timestamp-dos(20635)Vulnerability database, x_refsource_XF
- secunia.com15393Third-party advisory, x_refsource_SECUNIA
- kb.cert.orgVU#637934Third-party advisory, x_refsource_CERT-VN
- secunia.com15417Third-party advisory, x_refsource_SECUNIA
- secunia.com18662Third-party advisory, x_refsource_SECUNIA
- securityfocus.com13676Vulnerability database, x_refsource_BID
- cisco.com20050518 Vulnerability in a Variant of the TCP Timestamps OptionVendor advisory, x_refsource_CISCO
- secunia.com18222Third-party advisory, x_refsource_SECUNIA
- support.avaya.comelmodocs2/security/ASA-2006-032.htmx_refsource_CONFIRM
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<a href="https://intel.neosec.eu/en/cve/CVE-2005-0356"><img src="https://intel.neosec.eu/badge/cve/CVE-2005-0356.svg?lang=en" alt="CVE-2005-0356 – NEOSEC Intel" height="20"></a>