CVE-2025-40778VulnerabilityPublished 26 Nov 2025Updated 12 Oct 2026

Red Hat Security Advisory: bind security update

Affects Red Hat bindSource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2025-40778· High 8.6

Not known to be exploited · CVSS 8.6 High.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score

8.6High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GitHubisc/bind`pkg:github/isc/bind`Other threats	Affected >=9.11.0 <=9.16.50 9.18.0 <=9.18.39 9.20.0 <=9.20.13 9.21.0 <=9.21.12	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released an official security update for BIND in Red Hat Enterprise Linux 8 that addresses CVE-2025-40778. Users should apply the provided update packages as described in the Red Hat advisory (RHSA-2025:19835) to remediate this vulnerability. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the official patch.

Description

This update for bind fixes the following issues: - Upgrade to release 9.20.15 Security Fixes: * CVE-2025-40778: Fixed cache poisoning attacks with unsolicited RRs (bsc#1252379) * CVE-2025-40780: Fixed cache poisoning due to weak PRNG (bsc#1252380) * CVE-2025-8677: Fixed resource exhaustion via malformed DNSKEY handling (bsc#1252378) New Features: * Add dnssec-policy keys configuration check to named-checkconf. * Add a new option `manual-mode` to dnssec-policy. * Add a new option `servfail-until-ready` to response-policy zones. * Support for parsing HHIT and BRID records has been added. * Support for parsing DSYNC records has been added. Removed Features: * Deprecate the `tkey-gssapi-credential` statement. * Obsolete the `tkey-domain` statement. Feature Changes: * Add deprecation warnings for RSASHA1, RSASHA1-NSEC3SHA1, and DS digest type 1. Bug Fixes: * Missing DNSSEC information when CD bit is set in query. * rndc sign during ZSK rollover will now replace signatures. * Use signer name when disabling DNSSEC algorithms. * Preserve cache when reload fails and reload the server again. * Prevent spurious SERVFAILs for certain 0-TTL resource records. * Fix unexpected termination if catalog-zones had undefined `default-primaries`. * Stale RRsets in a CNAME chain were not always refreshed. * Add RPZ extended DNS error for zones with a CNAME override policy configured. * Fix dig +keepopen option. * Log dropped or slipped responses in the query-errors category. * Fix synth-from-dnssec not working in some scenarios. * Clean enough memory when adding new ADB names/entries under memory pressure. * Prevent spurious validation failures. * Ensure file descriptors 0-2 are in use before using libuv [bsc#1230649]

Impact

Successful exploitation of this vulnerability could allow an attacker to poison the DNS cache of a vulnerable BIND server, potentially redirecting DNS queries to malicious destinations. This can undermine DNS integrity and trust, impacting network communications that rely on DNS resolution. The advisory does not report known exploits in the wild at this time.

Summary

CVE-2025-40778 is a vulnerability in BIND, the DNS protocol implementation used in Red Hat Enterprise Linux 8, that permits cache poisoning attacks through unsolicited resource records. The flaw affects the DNS server and resolver library components, potentially allowing attackers to inject malicious DNS data into the cache. Red Hat Product Security has released an update for BIND in Red Hat Enterprise Linux 8 to fix this vulnerability. The advisory classifies the update as important and provides packages to remediate the issue. No CVSS score is provided in the advisory, but the severity is rated as high.

CWE-347Improper Verification of Cryptographic Signature (opens in a new tab)
Base weaknessOWASP Top 10 A04:2025: Cryptographic Failures (opens in a new tab)
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
OWASP Cheat Sheets
XML Security (opens in a new tab)
REST Security (opens in a new tab)
JSON Web Token for Java (opens in a new tab)
REST Assessment (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.2 (opens in a new tab)
V3.5.3 (opens in a new tab)
V13.2.6 (opens in a new tab)
Attack patterns
Padding Oracle Crypto Attack (opens in a new tab)
Signature Spoofing by Improper Validation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 7 Jul 2026, 13:24 UTC

WeaknessesCWE-347

Technical details

References

Community reviews

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