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Vulnerabilities

Vulnerability · CVE-2025-58801

Cross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.

Published Sep 5, 2025 · catalog updated May 12, 2026 · KCS Responder

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-58801. EPSS is 0.14%. Act only if a listed version of KCS Responder is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.14%
Remediation
Advisory link
Affected products
vendor KCS Responder 0 ≤4.3.8

Cross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor KCS Responder 0 ≤4.3.80 ≤4.3.8

How to fix CVE-2025-58801

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-2025-58801. EPSS is 0.14%. Act only if a listed version of KCS Responder is installed.

Which versions are affected?

Compare what you have installed with KCS Responder 0 ≤4.3.8 0 ≤4.3.8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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. Sep 5, 2025 · EUVD

    Detected

    Cross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.

  2. May 12, 2026 · EUVD

    Updated

    Cross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.

Sources

  • CVE.orgVulnerability recordCVE-2025-58801

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-58801

    30-day exploitation probability 0.14%

    first.org
  • EUVDVulnerability recordEUVD-2025-26976

    Cross-Site Request Forgery (CSRF) vulnerability in KCS Responder responder allows Cross Site Request Forgery.This issue affects Responder: from n/a through <= 4.3.8.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 21, 2026