7.5

CVE-2025-40777

A possible assertion failure when 'stale-answer-client-timeout' is set to '0'

If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure.
This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerISC
≫
Produkt BIND 9
Default Statusunaffected
Version <= 9.20.10
Version 9.20.0
Status affected
Version <= 9.21.9
Version 9.21.0
Status affected
Version <= 9.20.10-S1
Version 9.20.9-S1
Status affected
Version <= 9.18.37
Version 9.18.0
Status unaffected
Version <= 9.18.37-S1
Version 9.18.11-S1
Status unaffected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.1% 0.275
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-officer@isc.org 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-617 Reachable Assertion

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.