How severe is CVE-2025-40775?

CVE-2025-40775 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-40775 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-40775?

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-2025-40775 have an EU (EUVD) identifier?

Yes. CVE-2025-40775 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16006.

When was CVE-2025-40775 published?

CVE-2025-40775 was published on 2025-05-21 and last updated on 2026-06-17.

CVE-2025-40775

CVE-2025-40775 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-232.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16006
Weakness: CWE-232
Published: 2025-05-21
Last modified: 2026-06-17

Description

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

Frequently asked questions

What is CVE-2025-40775?: When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.
How severe is CVE-2025-40775?: CVE-2025-40775 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-40775 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-40775?: 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-2025-40775 have an EU (EUVD) identifier?: Yes. CVE-2025-40775 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16006.
When was CVE-2025-40775 published?: CVE-2025-40775 was published on 2025-05-21 and last updated on 2026-06-17.

References

Other CWE-232 vulnerabilities

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