HighCVE-2024-8534

Memory safety vulnerability leading to memory corruption and Denial of Service (CVE-2024-8534)

Published 12.11.2024Sources: CVE.org

What is affected, what to do

Memory safety vulnerability leading to memory corruption and Denial of Service in NetScaler ADC and Gateway if the appliance must be configured as a Gateway (VPN Vserver) with RDP Feature enabled OR the appliance must be configured as a Gateway (VPN Vserver) and RDP Proxy Server Profile is created and set to Gateway (VPN Vserver) OR the appliance must be configured as a Auth Server (AAA Vserver) with RDP Feature enabled

Update NetSclaer NetScaler ADC to version 29.72, NetSclaer NetScaler ADC to version 55.34, NetSclaer NetScaler ADC to version 37.207.

Affected: NetSclaer NetScaler ADC lt 14.1..29.72
NetSclaer NetScaler ADC lt 13.1..55.34
NetSclaer NetScaler ADC lt 13.1-FIPS..37.207
NetSclaer NetScaler ADC lt 12.1-NDcPP..55.321
NetScaler Gateway lt 14.1..29.72
NetScaler Gateway lt 13.1..55.34
NetScaler Gateway lt 13.1-FIPS..37.207
NetScaler Gateway lt 12.1-NDcPP..55.321
Fixed in: NetSclaer NetScaler ADC 29.72
NetSclaer NetScaler ADC 55.34
NetSclaer NetScaler ADC 37.207
NetSclaer NetScaler ADC 55.321
NetScaler Gateway 29.72
NetScaler Gateway 55.34
NetScaler Gateway 37.207
NetScaler Gateway 55.321

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Metrics

8.4

Priority

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

Source: Vendor (CNA), CVSS v4

8.1

CVSS v3

Severity High on the scale from 0 to 10.

Source: CVE.org

0.6 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 45.8

Show all metrics

Severity: High
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: 65.68 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: 8.4 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: 8.1
CVSS v4 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: 8.4
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: 0.6 %; 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: 45.8; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: 12.11.2024
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-119

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: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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

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 versions	Fixed in
NetScaler	NetScaler Gateway	`12.1-NDcPP – < 55.321` `13.1 – < 55.34` `13.1-FIPS – < 37.207` `14.1 – < 29.72`	`55.321` `55.34` `37.207` `29.72`
NetSclaer	NetScaler ADC	`14.1 – < 29.72` `12.1-NDcPP – < 55.321` `13.1-FIPS – < 37.207` `13.1 – < 55.34`	`29.72` `55.321` `37.207` `55.34`
citrix	netscaler_application_delivery_controller	`13.1 – < 13.1-37.207` `14.1 – < 14.1-29.72` `12.1 – < 12.1-55.321` `12.1 – < 13.1-55.34`	`13.1-37.207` `14.1-29.72` `12.1-55.321` `13.1-55.34`
citrix	netscaler_gateway	`14.1 – < 14.1-29.72` `12.1 – < 13.1-55.34`	`14.1-29.72` `13.1-55.34`

Vendors and products

Weakness classes (CWE)

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
Class
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
Entry at MITRE CWE-119

References & sources

support.citrix.coms/article/CTX691608-netscaler-adc-and-netscaler-gateway-securit…Vendor advisory

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<a href="https://intel.neosec.eu/en/cve/CVE-2024-8534"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-8534.svg?lang=en" alt="CVE-2024-8534 – NEOSEC Intel" height="20"></a>