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ExploitedIn CISA KEVFix available

CVE-2020-3452

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2020-07-22
  • Fixed in9.14.1.10 · 9.13.1.10 · 9.12.3.12 · 9.10.1.42 · 9.9.2.74 · 9.8.4.20
  • WeaknessCWE-20 · CWE-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 read sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of URLs in HTTP requests processed by an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device. The web services file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability cannot be used to obtain access to ASA or FTD system files or underlying operating system (OS) files.

Timeline

dates in UTC
  1. 2020-07-2220:15CVE publishedNVD
  2. 2020-07-28Exploit-DB entryExploit-DB
  3. 2021-11-03Added to the CISA KEV catalogCISA KEV
  4. 2021-11-03Listed as exploited by GCVEGCVE
  5. 2021-11-03Exploitation first reportedCISA KEV
  6. 2025-02-0415:34SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 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-2020-3452?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3452?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ASAversion to verify
BranchAffectedFixed in
9.14≥ 9.14, < 9.14.1.109.14.1.10
9.13≥ 9.13, < 9.13.1.109.13.1.10
9.12≥ 9.12, < 9.12.3.129.12.3.12
9.10≥ 9.10, < 9.10.1.429.10.1.42
9.9≥ 9.9, < 9.9.2.749.9.2.74
9.8≥ 9.8, < 9.8.4.209.8.4.20
9.6≥ 9.6, < 9.6.4.429.6.4.42
Cisco secure firewall threat defense
BranchAffectedFixed in
6.6≥ 6.6.0, < 6.6.0.16.6.0.1
6.5≥ 6.5.0, < 6.5.0.56.5.0.5
6.4≥ 6.4.0, < 6.4.0.106.4.0.10
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
    Affected
    • < 9.6.4.42fixed in 9.6.4.42custom
    • < 9.8.4.20fixed in 9.8.4.20custom
    • < 9.9.2.74fixed in 9.9.2.74custom
    • < 9.10.1.42fixed in 9.10.1.42custom
    • < 9.13.1.10fixed in 9.13.1.10custom
    • < 9.14.1.10fixed in 9.14.1.10custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-12-15

Fix

  1. Update Cisco ASA to 9.14.1.10 · 9.13.1.10 · 9.12.3.12 · 9.10.1.42 · 9.9.2.74 · 9.8.4.20 · 9.6.4.42
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-48722EDB-48871EDB-49262
Exploit-DB
Proof-of-concept repositories
20 repositories, unverifiedXDev05/CVE-2020-3452-PoCLoneyers/cve-2020-3452PR3R00T/CVE-2020-3452-Cisco-Scannermr-r3b00t/CVE-2020-3452foulenzer/CVE-2020-3452
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

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
2020-07-22
Last Modified
2026-08-11
NVD status
Analyzed
GitHub Advisory
GHSA-q26c-r46f-6fcq

Frequently asked questions

What is CVE-2020-3452?

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 read sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of URLs in HTTP requests processed by an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device. The web services file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability cannot be used to obtain access to ASA or FTD system files or underlying operating system (OS) files.

Is CVE-2020-3452 actively exploited?

Yes. CVE-2020-3452 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 2022-05-03.

What is the CVSS score for CVE-2020-3452?

CVE-2020-3452 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.

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