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HighKEVRansomware

CVE-2020-3259 — Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

CVE-2020-3259 · Secure Firewall ASA · CVSS 7.5 · KEV

In brief

Severity · CVSS
High7.5CVSS 3.1, High
EPSS
72%
CISA KEV
Known exploited, listed since 15 Feb 2024
CERT-FR
No advisory or alert referenced in the catalog
Vendor
Cisco
Published · Modified
·
Last verified

Summary

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

Weakness: CWE-200

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

6 branches with a published fixed release · 3 branches to migrate

Cisco Adaptive Security Appliance (ASA) Software

Source: cisco-sa-asaftd-info-disclose-9eJtycMB

  1. 9.14End of life
    Affected versionsNot affected
    First fixed release—
  2. 9.13End of life
    Affected versions< 9.13.1.10
    First fixed release9.13.1.10
  3. 9.12End of life
    Affected versions< 9.12.3.9
    First fixed release9.12.3.9
  4. 9.10End of life
    Affected versions< 9.10.1.40
    First fixed release9.10.1.40
  5. 9.9End of life
    Affected versions< 9.9.2.67
    First fixed release9.9.2.67
  6. 9.8End of life
    Affected versions< 9.8.4.20
    First fixed release9.8.4.20
  7. 9.7End of life
    Affected versionsAll releases of the branch
    First fixed releaseMigration to a fixed release required
  8. 9.6End of life
    Affected versions< 9.6.4.41
    First fixed release9.6.4.41
  9. before 9.5End of life
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release required
  10. 9.5End of life
    Affected versionsAll releases of the branch
    First fixed releaseMigration to a fixed release required

Remediation

Fix available

Vendor fix

  • Adaptive Security Appliance (ASA) Software 9.139.13.1.10
  • Adaptive Security Appliance (ASA) Software 9.129.12.3.9
  • Adaptive Security Appliance (ASA) Software 9.109.10.1.40
  • Adaptive Security Appliance (ASA) Software 9.99.9.2.67
  • Adaptive Security Appliance (ASA) Software 9.89.8.4.20
  • Adaptive Security Appliance (ASA) Software 9.69.6.4.41

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Branches without a fix of their own: migrate to a fixed release

  • Adaptive Security Appliance (ASA) Software 9.7
  • Adaptive Security Appliance (ASA) Software 9.5
  • Adaptive Security Appliance (ASA) Software 9.5

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-asaftd-info-disclose-9eJtycMB

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-asaftd-info-disclose-9eJtycMB

CISA KEV required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA due date:

SourceCISA KEV

Last verified 1 Oct 2026 at 09:30 UTC

Known exploitation

Added to CISA KEV on 15 Feb 2024

Federal remediation due date: 7 Mar 2024

Known use in ransomware campaigns

The CISA required action is shown under Remediation.

72% probability of exploitation in the next 30 days (percentile 99%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CERT-FR

No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

Vendor advisory

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-asaftd-info-disclose-9eJtycMB

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service VulnerabilityHighKEV
  • CVE-2025-20362Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization VulnerabilityHighKEV
  • CVE-2025-20333Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow VulnerabilityCriticalKEV
  • CVE-2024-20481Cisco ASA and FTD Denial-of-Service VulnerabilityMediumKEV
  • CVE-2024-20359Cisco ASA and FTD Privilege Escalation VulnerabilityMediumKEV

All Secure Firewall ASA vulnerabilitiesAll Cisco vulnerabilities