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Fencer Intel
critical 9.1

CVE-2020-3187 in the critical feed json

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Path Traversal Vulnerability

published 6y ago modified 2mo ago also EUVD-2020-24458

cvss
9.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
96.5%
EPSS 96.5% chance of exploitation in 30 days, percentile 99.8%
public exploits
1
Exploit-DB, plus a Nuclei check

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 conduct directory traversal attacks and obtain read and delete access to sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences. An exploit could allow the attacker to view or delete arbitrary files on the targeted system. When the device is reloaded after exploitation of this vulnerability, any files that were deleted are restored. The attacker can only view and delete files within the web services file system. This file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability can not be used to obtain access to ASA or FTD system files or underlying operating system (OS) files. Reloading the affected device will restore all files within the web services file system.

Patch / fix

  • cisco secure_firewall_threat_defense 6.2.3.16, 6.3.0.6, 6.4.0.8, 6.5.0.4
  • cisco adaptive_security_appliance_software 9.6.4.40, 9.8.4.15, 9.9.2.66, 9.10.1.37, 9.12.3.2, 9.13.1.7

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Timeline

  1. Published
  2. First public exploit (EDB-48723)

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

96.50% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-48723 Cisco Adaptive Security Appliance Software 9.7 - Unauthenticated Arbitrary File Deletion webapps, 2020-07-29
  • Nuclei template Cisco Adaptive Security Appliance Software/Cisco Firepower Threat Defense - Directory Traversal nuclei detection template
  • packetstormsecurity.com http://packetstormsecurity.com/files/158648/Cisco-Adaptive-Security-Appliance-Software-9.7-Arbitrary-File-Deletion.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Cisco Cisco Adaptive Security Appliance (ASA) Software

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Intel 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.