TI-2026-16270 Aliases CVE-2026-20056 GHSA-5v8r-9wmj-294x

Cisco Secure Web Appliance TBD Bypass Vulnerability

LOW 18CWE-494Published 2026-02-04 · Updated 2026-02-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: None · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-494.

Summary

A vulnerability in the Dynamic Vectoring and Streaming (DVS) Engine implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass the anti-malware scanner, allowing malicious archive files to be downloaded. This vulnerability is due to improper handling of certain archive files. An attacker could exploit this vulnerability by sending a crafted archive file, which should be blocked, through an affected device. A successful exploit could allow the attacker to bypass the anti-malware scanner and download malware onto an end user workstation. The downloaded malware will not automatically execute unless the end user extracts and launches the malicious file. 

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00166 5th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco Secure Web Appliance	11.8.0-453; 12.5.3-002; 12.0.3-007; 12.0.3-005; 14.1.0-032; 14.1.0-047; 14.1.0-041; 12.0.4-002; 14.0.2-012; 11.8.0-414; 12.0.1-268; 11.8.1-023; 11.8.3-021; 11.8.3-018; 12.5.1-011; 11.8.4-004; 12.5.2-007; 12.5.2-011; 14.5.0-498; 12.5.4-005; 12.5.4-011; 12.0.5-011; 14.0.3-014; 12.5.5-004; 12.5.5-005; 12.5.5-008; 14.0.4-005; 14.5.1-008; 14.5.1-016; 15.0.0-355; 15.0.0-322; 12.5.6-008; 15.1.0-287; 14.5.2-011; 15.2.0-116; 14.0.5-007; 15.2.0-164; 14.5.1-510; 12.0.2-012; 12.0.2-004; 14.5.1-607; 14.5.3-033; 15.0.1-004; 15.2.1-011; 14.5.0-673; 14.5.0-537; 12.0.1-334; 14.0.1-503; 14.0.1-053; 11.8.0-429; 14.0.1-040; 14.0.1-014; 12.5.1-043; 15.2.2-009; 15.5.0-566; 15.2.3-007; 15.5.0-574; 15.5.0-710; 15.2.4-022; 15.5.1-002	—	No fix listed	CNA

Cisco Secure Web Appliance VendorCisco Affected 11.8.0-453; 12.5.3-002; 12.0.3-007; 12.0.3-005; 14.1.0-032; 14.1.0-047; 14.1.0-041; 12.0.4-002; 14.0.2-012; 11.8.0-414; 12.0.1-268; 11.8.1-023; 11.8.3-021; 11.8.3-018; 12.5.1-011; 11.8.4-004; 12.5.2-007; 12.5.2-011; 14.5.0-498; 12.5.4-005; 12.5.4-011; 12.0.5-011; 14.0.3-014; 12.5.5-004; 12.5.5-005; 12.5.5-008; 14.0.4-005; 14.5.1-008; 14.5.1-016; 15.0.0-355; 15.0.0-322; 12.5.6-008; 15.1.0-287; 14.5.2-011; 15.2.0-116; 14.0.5-007; 15.2.0-164; 14.5.1-510; 12.0.2-012; 12.0.2-004; 14.5.1-607; 14.5.3-033; 15.0.1-004; 15.2.1-011; 14.5.0-673; 14.5.0-537; 12.0.1-334; 14.0.1-503; 14.0.1-053; 11.8.0-429; 14.0.1-040; 14.0.1-014; 12.5.1-043; 15.2.2-009; 15.5.0-566; 15.2.3-007; 15.5.0-574; 15.5.0-710; 15.2.4-022; 15.5.1-002 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:asyncos::::::::	—	—	Cisco

cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* Versions — — ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-20056
2026-10-03 Alias added: GHSA-5v8r-9wmj-294x

References

Other 1

cisco-sa-wsa-archive-bypass-Scx2e8zF

TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
TI-2026-53490 Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0

See all 7059 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences