CVE-2025-40778 - CVE House
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Status published High CVE-2025-40778

Cache poisoning attacks with unsolicited RRs

Vulnerability Description

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 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • ISC would like to thank Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan from Tsinghua University for bringing this vulnerability to our attention.

References

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Affected Vendor

Affected Software

BIND 9
Vulnerable Versions:
9.11.0, 9.18.0, 9.20.0, 9.21.0, 9.11.3-S1, 9.18.11-S1, 9.20.9-S1

Timeline

Official Publish: October 22nd, 2025
Last Modified: February 26th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Weaknesses (CWE)

CWE-349

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.