Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-1359

28
FAUCET Score

CVE-2021-1359 is a high-severity command injection vulnerability in Cisco AsyncOS for Web Security Appliance (WSA) that allows an authenticated, remote attacker to elevate privileges to root. This flaw stems from insufficient validation of user-supplied XML input, enabling an attacker to upload crafted configuration files containing scripting code. A successful exploit grants arbitrary command execution on the underlying operating system. While there is no known active exploitation or public exploit code, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
11.8.0-429CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:11.8.0-429:*:*:*:*:*:*:*
11.8.0-453CPE matchmatch criteria
cpe:2.3:a:cisco:web_security_appliance:11.8.0-453:*:*:*:*:*:*:*
>= 11.8.0, < 12.0.3-005CPE matchmatch criteria
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*
>= 12.5.0, < 12.5.2CPE matchmatch criteria
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.88%
Probability of exploitation in next 30 days
EPSS Percentile
77.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0188 is in the 76th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ
Vendor Advisory