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CVE-2025-40778: Cache poisoning attacks with unsolicited RRs

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-22 · updated 2026-10-08
• Weakness: CWE-349

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.

Affected products

• ISC BIND: from 9.11.0 through 9.16.50; from 9.18.0 through 9.18.39; from 9.20.0 through 9.20.13; from 9.21.0 through 9.21.12; from 9.11.3-S1 through 9.16.50-S1; from 9.18.11-S1 through 9.18.39-S1

References

• https://kb.isc.org/docs/cve-2025-40778
• http://www.openwall.com/lists/oss-security/2025/10/22/1
• https://gist.github.com/N3mes1s/f76b4a606308937b0806a5256bc1f918

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