CVE-2020-3259
Actively exploited. CVE-2020-3259 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-02-15) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching 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
- 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.
⚡ Watch CVE-2020-3259
Get an email if CVE-2020-3259 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2020-3259: Cisco ASA and FTD Information Disclosure Vulnerabilitycisa-kev · 2024-02-15
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2020-3259)