How severe is CVE-2025-21611?

CVE-2025-21611 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-21611 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21611?

CVE-2025-21611 affects Tgstation13 Tgstation-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-21611?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-21611 have an EU (EUVD) identifier?

Yes. CVE-2025-21611 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2571.

When was CVE-2025-21611 published?

CVE-2025-21611 was published on 2025-01-06 and last updated on 2026-06-17.

CVE-2025-21611

CVE-2025-21611 is a high-severity vulnerability in Tgstation13 Tgstation-server with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2571
Weakness: CWE-285
Affected product: Tgstation13 Tgstation-server
Published: 2025-01-06
Last modified: 2026-06-17

Description

tgstation-server is a production scale tool for BYOND server management. Prior to 6.12.3, roles used to authorize API methods were incorrectly OR'd instead of AND'ed with the role used to determine if a user was enabled. This allows enabled users access to most, but not all, authorized actions regardless of their permissions. Notably, the WriteUsers right is unaffected so users may not use this bug to permanently elevate their account permissions. The fix is release in tgstation-server-v6.12.3.

Frequently asked questions

What is CVE-2025-21611?: tgstation-server is a production scale tool for BYOND server management. Prior to 6.12.3, roles used to authorize API methods were incorrectly OR'd instead of AND'ed with the role used to determine if a user was enabled. This allows enabled users access to most, but not all, authorized actions regardless of their permissions. Notably, the WriteUsers right is unaffected so users may not use this bug to permanently elevate their account permissions. The fix is release in tgstation-server-v6.12.3.
How severe is CVE-2025-21611?: CVE-2025-21611 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-21611 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21611?: CVE-2025-21611 affects Tgstation13 Tgstation-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-21611?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-21611 have an EU (EUVD) identifier?: Yes. CVE-2025-21611 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2571.
When was CVE-2025-21611 published?: CVE-2025-21611 was published on 2025-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tgstation13:tgstation-server:*:*:*:*:*:*:*:*

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Other CWE-285 (Improper Authorization) vulnerabilities

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CVE-2026-34048 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
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