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Fencer Vulns
high 7.5

CVE-2020-3259 kev+ ransomware in the critical feed json

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

published 2020-05-06 6 y ago modified 2026-08-12 2 mo ago also EUVD-2020-24530

cvss
7.5
version 3.0, CNA
cisa kev
Exploited
added 2024-02-15, used in ransomware
epss
71.5%
EPSS 71.5% chance of exploitation in 30 days, percentile 99.4%
public exploits
0
none known

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.

Patch / fix

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

  • cisco firepower_threat_defense 6.2.3.16, 6.3.0.6, 6.4.0.9, 6.5.0.5
  • cisco adaptive_security_appliance_software 9.8.4.20, 9.9.2..67, 9.10.1.40, 9.12.3.9, 9.13.1.10

Timeline

  1. Published
  2. CISA SSVC: exploitation active
  3. Added to CISA KEV
  4. CISA patch deadline

Known exploited

Added
2 y ago
Patch by
2024-03-07 (2 y ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor, product
Cisco, Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
CISA name
Cisco ASA and FTD Information Disclosure Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

  • Akira ransomware gang

reported by cisa.gov

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

71.50% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Cisco Cisco Adaptive Security Appliance (ASA) Software
  • cisco firepower_threat_defense
  • cisco adaptive_security_appliance_software

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.