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Vulnerabilities/CVE-2025-20363Public Intelligence Dossier
Source: cisco · Limited verification•Last verified: •Collection Degraded
CVE-2025-20363Unknown / EvaluatingCRITICAL (raw)CVSS 9.0CWE-122

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

Published: 25 Sept 2025•Last updated: 19 Oct 2026, 02:40 AM IST•Source identifier: psirt@cisco.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.0CRITICAL (raw)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Metric sourcepsirt@cisco.com
EPSS probability
6.9%0.069
Percentile94th
Weakness type
CWE-122
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High Severity / Review

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical CVSS without confirmed KEV exploitation

Affected Products & Remediation

5 source-backed products
Affected products and versions (source)
  • cisco ios xr · 6.5.1; 6.5.2; 6.5.3; 6.6.2; 6.6.3; 6.6.25; 6.7.1; 6.7.2; 6.7.3; 6.8.1; 6.8.2; 6.9.1; 6.9.2 · NVD CPE · Source
  • cisco adaptive security appliance software · >= 9.12 < 9.12.4.72; >= 9.14 < 9.14.4.28; >= 9.16 < 9.16.4.84; >= 9.17.1 < 9.18.4.57; >= 9.19.1 < 9.19.1.42; >= 9.20.1 < 9.20.3.16; >= 9.22 < 9.22.2; >= 9.23 < 9.23.1.3 · NVD CPE · Source
  • cisco ios · xr 6.5.1; xr 6.5.2; xr 6.5.3; xr 6.6.2; xr 6.6.3; xr 6.6.25; xr 6.7.1; xr 6.7.2; xr 6.7.3; xr 6.8.1; xr 6.8.2; xr 6.9.1; xr 6.9.2; >= 12.2\(15\)b <= 15.9\(3\)m11; xe >= 3.2.0sg <= 17.17.1 · NVD CPE · Source
  • cisco ios xe · >= 3.2.0sg <= 17.17.1 · NVD CPE · Source
  • cisco secure firewall threat defense · >= 7.0.0 < 7.0.8; >= 7.1.0 < 7.2.10; >= 7.3.0 < 7.4.2.3; >= 7.7.0 < 7.7.10; 7.6.0 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
psirt@cisco.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.7.1:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:x86:*, cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:x86:*

Evidence & Provenance

2 public sources
sec.cloudapps.cisco.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-20363
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-20363
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-20363"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library
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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.