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CVE-2020-3259: Cisco ASA and FTD Information Disclosure Vulnerability

criticalknown exploitedCVE-2020-3259
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability. An attacker could retrieve memory contents on an affected device, which could lead to the disclosure of confidential information due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. This vulnerability affects only specific AnyConnect and WebVPN configurations.

CSIRTS triage

vendor: Ciscoproduct: Adaptive Security Appliance (ASA)Information disclosure
What
An attacker could retrieve memory contents on an affected device, leading to the disclosure of confidential information.
Who is affected
Deployments of Cisco ASA and FTD with specific AnyConnect and WebVPN configurations are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patches provided by Cisco.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2024-02-15
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-3259

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-3259coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco ASA and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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