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Public proof of conceptFix available

CVE-2020-3187

A public proof of concept exists; no exploitation attested.

  • Published2020-05-06
  • Fixed in9.13.1.7 · 9.12.3.2 · 9.10.1.37 · 9.9.2.66 · 9.8.4.15 · 9.6.4.40
  • WeaknessCWE-22

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 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.

Timeline

dates in UTC
  1. 2020-05-0617:15CVE publishedNVD
  2. 2020-07-29Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-3187?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3187?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ASA
BranchAffectedFixed in
9.13≥ 9.13, < 9.13.1.79.13.1.7
9.12≥ 9.12, < 9.12.3.29.12.3.2
9.10≥ 9.10, < 9.10.1.379.10.1.37
9.9≥ 9.9, < 9.9.2.669.9.2.66
9.8≥ 9.8, < 9.8.4.159.8.4.15
9.6≥ 9.6, < 9.6.4.409.6.4.40
Cisco secure firewall threat defense
BranchAffectedFixed in
6.5≥ 6.5.0, < 6.5.0.46.5.0.4
6.4≥ 6.4.0, < 6.4.0.86.4.0.8
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 asa 5505 firmwareversion to verify
BranchAffectedFixed in
9.6= 9.6\(4\)no fix published

11 more products in the sources.

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 2020-07-29

Fix

  1. Update Cisco ASA to 9.13.1.7 · 9.12.3.2 · 9.10.1.37 · 9.9.2.66 · 9.8.4.15 · 9.6.4.40

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-48723
Exploit-DB
Proof-of-concept repositories
5 repositories, unverifiedCrackerCat/CVE-2020-31871337in/CVE-2020-3187sujaygr8/CVE-2020-3187sunyyer/CVE-2020-3187-ScanlistCappricio-Securities/CVE-2020-3187
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2020-05-06
Last Modified
2026-08-11
NVD status
Modified
GitHub Advisory
GHSA-5f48-6vm9-w28v

Frequently asked questions

What is CVE-2020-3187?

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.

Is CVE-2020-3187 actively exploited?

Active exploitation of CVE-2020-3187 has not been confirmed. Its EPSS score was 96.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-3187?

CVE-2020-3187 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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