Skip to main content
ExploitedIn CISA KEVFix available

CVE-2020-3259

Exploitation confirmed. First attested on 2024-02-15 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2020-05-06
  • Fixed in9.13.1.10 · 9.12.3.9 · 9.10.1.40 · 9.9.2.67 · 9.9.2..67 · 9.8.4.20
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-05-0617:15CVE publishedNVD
  2. 2024-02-15Added to the CISA KEV catalogCISA KEV
  3. 2024-02-15Listed as exploited by GCVEGCVE
  4. 2024-02-15Exploitation first reportedCISA KEV
  5. 2024-10-2417:40SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD · CISA-ADP
Cisco ASA
BranchAffectedFixed in
9.13≥ 9.13, < 9.13.1.109.13.1.10
9.12≥ 9.12, < 9.12.3.99.12.3.9
9.10≥ 9.10, < 9.10.1.409.10.1.40
9.9≥ 9.9, < 9.9.2.679.9.2.67
9.9≥ 9.9, < 9.9.2..679.9.2..67
9.8≥ 9.8, < 9.8.4.209.8.4.20
Cisco firepower threat defense
BranchAffectedFixed in
6.5≥ 6.5.0, < 6.5.0.56.5.0.5
6.4≥ 6.4.0, < 6.4.0.96.4.0.9
6.3≥ 6.3.0, < 6.3.0.66.3.0.6
6.2≥ 6.2.3, < 6.2.3.166.2.3.16
Cisco secure firewall threat defense
BranchAffectedFixed in
6.5≥ 6.5.0, < 6.5.0.56.5.0.5
6.4≥ 6.4.0, < 6.4.0.96.4.0.9
6.3≥ 6.3.0, < 6.3.0.66.3.0.6
6.2≥ 6.2.3, < 6.2.3.166.2.3.16

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As cisco, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Cisco Adaptive Security Appliance (ASA) Software

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-05-06

Fix

  1. Update Cisco ASA to 9.13.1.10 · 9.12.3.9 · 9.10.1.40 · 9.9.2.67 · 9.9.2..67 · 9.8.4.20
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-03-07

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-02-15
Patch Due Date
2024-03-07
Ransomware Use
Known
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2020-05-06
Last Modified
2026-08-12
NVD status
Analyzed
GitHub Advisory
GHSA-vw99-pf8w-g3cw

Frequently asked questions

What is CVE-2020-3259?

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.

Is CVE-2020-3259 actively exploited?

Yes. CVE-2020-3259 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-03-07.

What is the CVSS score for CVE-2020-3259?

CVE-2020-3259 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, February 2024Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record