CVE-2025-40780

Cache poisoning due to weak PRNG

At a glance

Severity: HIGH 8.6
EPSS: EPSS 0.47 % · percentile 40 (2026-10-27)
State: PUBLISHED
Published: 2025-10-22
Updated: 2025-11-04
Assigner: isc
NVD status: Deferred

Description

In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 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, 9.16.8-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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N	isc
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N	NVD · security-officer@isc.org (Secondary)

Weaknesses (CWE)

CWE-341

European references

ENISA EUVD · EUVD-2025-35609
GCVE · GCVE-0-2025-40780

CERT-FR advisories

CERTFR-2026-AVI-0326 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-0316 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2025-AVI-0941 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
CERTFR-2025-AVI-0913 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr

Affected products

Product	Versions
ISC · BIND 9	affected 9.16.0 ≤ 9.16.50 ; affected 9.18.0 ≤ 9.18.39 ; affected 9.20.0 ≤ 9.20.13 ; affected 9.21.0 ≤ 9.21.12 ; affected 9.16.8-S1 ≤ 9.16.50-S1 ; affected 9.18.11-S1 ≤ 9.18.39-S1

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD