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Exploitation reportedNot in CISA KEV yetFix available

CVE-2025-20363

Exploitation reported by one source. First attested on 2025-09-26 by GCVE · kevintel.

  • Published2025-09-25
  • WeaknessCWE-122

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 of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, remote attacker (Cisco ASA and FTD Software) or authenticated, remote attacker (Cisco IOS, IOS XE, and IOS XR Software) with low user privileges to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web service on an affected device after obtaining additional information about the system, overcoming exploit mitigations, or both. A successful exploit could allow the attacker to execute arbitrary code as root, which may lead to the complete compromise of the affected device. For more information about this vulnerability, see the Details ["#details"] section of this advisory.

Timeline

dates in UTC
  1. 2025-09-2516:15CVE publishedNVD
  2. 2025-09-2611:08Listed as exploited by GCVEGCVE
  3. 2025-09-2611:08Exploitation first reportedGCVE

Versions per branch

NVD
Cisco ios xrversion to verify
BranchAffectedFixed in
6.5= 6.5.1no fix published
6.5= 6.5.2no fix published
6.5= 6.5.3no fix published
6.6= 6.6.2no fix published
6.6= 6.6.3no fix published
6.6= 6.6.25no fix published
6.7= 6.7.1no fix published
6.7= 6.7.2no fix published
6.7= 6.7.3no fix published
6.8= 6.8.1no fix published
6.8= 6.8.2no fix published
6.9= 6.9.1no fix published
Cisco ASA
BranchAffectedFixed in
9.23≥ 9.23, < 9.23.1.39.23.1.3
9.22≥ 9.22, < 9.22.29.22.2
9.20≥ 9.20.1, < 9.20.3.169.20.3.16
9.19≥ 9.19.1, < 9.19.1.429.19.1.42
9.x≥ 9.17.1, < 9.18.4.579.18.4.57
9.16≥ 9.16, < 9.16.4.849.16.4.84
9.14≥ 9.14, < 9.14.4.289.14.4.28
9.12≥ 9.12, < 9.12.4.729.12.4.72
Cisco secure firewall threat defense
BranchAffectedFixed in
7.7≥ 7.7.0, < 7.7.107.7.10
7.x≥ 7.3.0, < 7.4.2.37.4.2.3
7.x≥ 7.1.0, < 7.2.107.2.10
7.0≥ 7.0.0, < 7.0.87.0.8
7.6= 7.6.0no fix published

2 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 CNA5 products

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

  • Cisco IOS
    Affected
    • = 12.2(15)Bno fix stated
    • = 12.2(16)B1no fix stated
    • = 12.2(16)B2no fix stated
    • = 12.2(16)Bno fix stated
    • = 12.2(15)BC2ano fix stated
    • = 12.2(15)BC1ano fix stated
    • = 12.2(15)BC1bno fix stated
    • = 12.2(15)BC2dno fix stated

    1,997 more version lines in the CVE record.

  • Cisco IOS XR Software
    Affected
    • = 6.5.1no fix stated
    • = 6.5.2no fix stated
    • = 6.5.3no fix stated
    • = 6.6.2no fix stated
    • = 6.6.3no fix stated
    • = 6.6.25no fix stated
    • = 6.7.1no fix stated
    • = 6.7.2no fix stated

    5 more version lines in the CVE record.

  • Cisco Adaptive Security Appliance (ASA) Software
    Affected
    • = 9.8.1no fix stated
    • = 9.8.1.5no fix stated
    • = 9.8.1.7no fix stated
    • = 9.8.2no fix stated
    • = 9.8.2.8no fix stated
    • = 9.8.2.14no fix stated
    • = 9.8.2.15no fix stated
    • = 9.8.2.17no fix stated

    212 more version lines in the CVE record.

  • Cisco IOS XE Software
    Affected
    • = 3.2.0SGno fix stated
    • = 3.2.1SGno fix stated
    • = 3.2.2SGno fix stated
    • = 3.2.3SGno fix stated
    • = 3.2.4SGno fix stated
    • = 3.2.5SGno fix stated
    • = 3.2.6SGno fix stated
    • = 3.2.7SGno fix stated

    448 more version lines in the CVE record.

  • Cisco Firepower Threat Defense Software
    Affected
    • = 6.2.3no fix stated
    • = 6.2.3.1no fix stated
    • = 6.2.3.2no fix stated
    • = 6.2.3.3no fix stated
    • = 6.2.3.4no fix stated
    • = 6.2.3.5no fix stated
    • = 6.2.3.6no fix stated
    • = 6.2.3.7no fix stated

    86 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-09-25

Fix

Advisories and patches

Detection

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

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2025-09-25
Last Modified
2026-10-18
NVD status
Analyzed
GitHub Advisory
GHSA-8wv4-73v4-qxp2

Frequently asked questions

What is CVE-2025-20363?

A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, remote attacker (Cisco ASA and FTD Software) or authenticated, remote attacker (Cisco IOS, IOS XE, and IOS XR Software) with low user privileges to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web service on an affected device after obtaining additional information about the system, overcoming exploit mitigations, or both. A successful exploit could allow the attacker to execute arbitrary code as root, which may lead to the complete compromise of the affected device. For more information about this vulnerability, see the Details ["#details"] section of this advisory.

Is CVE-2025-20363 actively exploited?

Active exploitation of CVE-2025-20363 has not been confirmed. Its EPSS score was 7.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-20363?

CVE-2025-20363 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

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