TI-2021-00998 Aliases CVE-2021-1271 GHSA-xp9j-q8vg-2xqp

Cisco Web Security Appliance Stored Cross-Site Scripting Vulnerability

LOW 23CWE-79Published 2021-01-20 · Updated 2024-11-12

Key facts

Attack vector: Network
Privileges required: High
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

A vulnerability in the web-based management interface of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface of an affected device. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by inserting malicious data into a specific data field in an affected interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00797 56th 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 Web Security Appliance (WSA)	all versions	—	No fix listed	CNA

Cisco Web Security Appliance (WSA) VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:web_security_virtual_appliance::::::::	before 12.5.1	Vulnerable	Cisco

cpe:2.3:a:cisco:web_security_virtual_appliance:*:*:*:*:*:*:*:* Versions before 12.5.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-1271
2026-10-03 Alias added: GHSA-xp9j-q8vg-2xqp

References

Advisory 1

20210120 Cisco Web Security Appliance Stored Cross-Site Scripting Vulnerability

TI-2017-04505 A vulnerability in AsyncOS for the Cisco Web Security Appliance (WSA) could allow an… CVSS 3.0HIGH 7.5
TI-2017-04506 Improper input validation in Cisco Web Security Appliance CVSS 3.1HIGH 7.5
TI-2017-04503 Injection in Cisco Web Security Appliance CVSS 3.0MEDIUM 6.7
TI-2015-03535 The remote-support feature on Cisco Web Security Virtual Appliance (WSAv), Email Security… CVSS 2.0MEDIUM 5.0
TI-2017-04504 Cross-site scripting in Cisco Web Security Appliance CVSS 3.0MEDIUM 5.4
TI-2015-05274 Cisco Web Security Appliance (WSA) 8.0.6-078 and 8.0.6-115 allows remote attackers to… CVSS 2.0MEDIUM 5.0

See all 9 →

Sources

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