CVE-2023-20264

Open Redirect in Cisco Adaptive Security Appliance Software 9.18.1 – 9.18.3.46

Open Redirect

Published

01 November 2023

Modified

11 August 2026

Patch / advisory

View advisory

CVSS Score v3.1 6.1

Click a component to see what it means

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Score 0.0038 30th percentile

Risk Priority 46 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-20264 is a medium-severity Open Redirect (CWE-601) vulnerability in Cisco Adaptive Security Appliance Software. Its CVSS base score is 6.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data Obfuscation (T1001); ranked at the 30th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2023-24443

Vulnerability Data

A vulnerability in the implementation of Security Assertion Markup Language (SAML) 2.0 single sign-on (SSO) for remote access VPN in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to…

intercept the SAML assertion of a user who is authenticating to a remote access VPN session. This vulnerability is due to insufficient validation of the login URL. An attacker could exploit this vulnerability by persuading a user to access a site that is under the control of the attacker, allowing the attacker to modify the login URL. A successful exploit could allow the attacker to intercept a successful SAML assertion and use that assertion to establish a remote access VPN session toward the affected device with the identity and permissions of the hijacked user, resulting in access to the protected network.

CWE(s): CWE-601 NVD-CWE-noinfo

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001 Data Obfuscation Command And Control

Adversaries may obfuscate command and control traffic to make it more difficult to detect.

attack.mitre.org →

T1003.001 LSASS Memory Credential Access

Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).

attack.mitre.org →

T1003.002 Security Account Manager Credential Access

Adversaries may attempt to extract credential material from the Security Account Manager (SAM) database either through in-memory techniques or through the Windows Registry where the SAM database is stored.

attack.mitre.org →

T1003.005 Cached Domain Credentials Credential Access

Adversaries may attempt to access cached domain credentials used to allow authentication to occur in the event a domain controller is unavailable.

attack.mitre.org →

T1014 Rootkit Stealth

Adversaries may use rootkits to hide the presence of programs, files, network connections, services, drivers, and other system components.

attack.mitre.org →

T1016.002 Wi-Fi Discovery Discovery

Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.

attack.mitre.org →

Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-20341Same product: Cisco Adaptive Security Appliance Software

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CVE-2026-20106Same product: Cisco Adaptive Security Appliance Software

CVE-2026-20014Same product: Cisco Adaptive Security Appliance Software

CVE-2026-20015Same product: Cisco Adaptive Security Appliance Software

CVE-2026-20021Same product: Cisco Adaptive Security Appliance Software

CVE-2026-20105Same product: Cisco Adaptive Security Appliance Software

CVE-2026-20013Same product: Cisco Adaptive Security Appliance Software

CVE-2024-20331Same product: Cisco Adaptive Security Appliance Software

CVE-2024-20426Same product: Cisco Adaptive Security Appliance Software

Affected Assets

cisco

adaptive security appliance software

9.18.1 — 9.18.3.46 · 9.19.1.5 — 9.19.1.12

cisco

secure firewall threat defense

7.2.4

Mitigating Controls

Control response

Prevent

Stop it (NIST 800-53)

—

Detect

Catch it (NIST detect / respond)

—

Harden

Shrink the surface (DISA STIG)

—

Validate

Prove the fix (OWASP ASVS)

V3.7.2

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AT-2 Literacy Training and Awareness

addresses: CWE-601

Security awareness includes verifying URLs and avoiding untrusted redirects that lead to malicious sites.

SI-10 Information Input Validation

addresses: CWE-601

Validates redirect targets and URLs to ensure they conform to allowed destinations.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match

blocks

Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match

removes

A.5.15 Access control partial match

removes

A.5.16 Identity management partial match

removes

A.5.17 Authentication information partial match

removes

A.5.18 Access rights partial match

removes

A.8.10 Information deletion partial match

removes