ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-20353

CVE-2026-20353 is listed by Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026.

Published Oct 14, 2026 · Cisco

Check if you run it

No confirmed exploitation is on record for CVE-2026-20353. EPSS is 0.40%. Act only if a listed version of Cisco is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Not established
Affected products
Cisco

CVE-2026-20353 is listed by Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-20353

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20353. EPSS is 0.40%. Act only if a listed version of Cisco is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · Cisco Security Advisories

    Detected

    As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. These vulnerabilities were found during internal testing.

Sources

  • Cisco Security AdvisoriesVendor advisoryCVE-2026-20353

    As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases

    sec.cloudapps.cisco.com
  • CVE.orgVulnerability recordCVE-2026-20353

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20353

    30-day exploitation probability 0.4%

    first.org

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.