What is CVE-2025-40778?

CVE-2025-40778 is a high-severity vulnerability in Isc Bind 9, classified under CWE-349. CVSS score: 8.6/10. Published 2025-10-22.

How severe is CVE-2025-40778?

High severity. CVSS v3 base score is 8.6 out of 10.

Is CVE-2025-40778 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Isc Bind 9

CVE-2025-40778

Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 thro…

EPSS: 0.000 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.

Affected products

Isc Bind 9 — versions 9.11.0, 9.18.0, 9.20.0

Weakness classification (CWE)

CWE-349

Public proof-of-concept exploits

References

CVE-2025-40778 (vendor-advisory)

Frequently asked questions

What is CVE-2025-40778?: CVE-2025-40778 is a high-severity vulnerability in Isc Bind 9, classified under CWE-349. CVSS score: 8.6/10. Published 2025-10-22.
How severe is CVE-2025-40778?: High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2025-40778 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.