8.6

CVE-2025-40780: isc bind 9 Predictable from Observable State

CVSS: 8.6v3.1HighDeferred
AliasesALPINE-CVE-2025-40780UBUNTU-CVE-2025-40780DEBIAN-CVE-2025-40780
Published 22-10-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-40780 is a high (CVSS 8.6) Predictable from Observable State vulnerability in isc bind 9. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 38.9% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 27 · Related 12
DLA-4364-1DSA-6033-1MGASA-2025-0254OPENSUSE-SU-2025:15659-1OPENSUSE-SU-2026:20039-1RHSA-2025:19793

Timeline

  1. 22-10-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

0.00 pp

From 0.46% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard7 products
  • bind< 9.20.16-r0
  • bind-dev< 9.20.15-r0
  • bind-dnssec-root< 9.20.16-r0
  • bind-dnssec-tools< 9.20.16-r0
  • bind-libs< 9.20.16-r0
Wolfi7 products
  • bind< 9.20.16-r0
  • bind-dev< 9.20.15-r0
  • bind-dnssec-root< 9.20.16-r0
  • bind-dnssec-tools< 9.20.16-r0
  • bind-libs< 9.20.16-r0
Ubuntu3 products
  • bind9All versions (No fix recorded) | < 1:9.18.30-0ubuntu0.20.04.2+esm1 | < 1:9.18.39-0ubuntu0.22.04.2 | < 1:9.18.39-0ubuntu0.24.04.2 | < 1:9.20.11-1ubuntu2.1 | < 1:9.20.11-1ubuntu3
  • bind9-libsAll versions (No fix recorded)
  • isc-dhcpAll versions (No fix recorded)
Alpine1 product
  • bind< 9.18.41-r0 | < 9.20.15-r0
Debian1 product
  • bind9< 1:9.18.41-1~deb12u1 | < 1:9.20.15-1~deb13u1 | < 1:9.20.15-1
Isc1 product
  • bind 9≥ 9.16.0, ≤ 9.16.50 | ≥ 9.18.0, ≤ 9.18.39 | ≥ 9.20.0, ≤ 9.20.13 | ≥ 9.21.0, ≤ 9.21.12 | ≥ 9.16.8-S1, ≤ 9.16.50-S1 | ≥ 9.18.11-S1, ≤ 9.18.39-S1 | ≥ 9.20.9-S1, ≤ 9.20.13-S1

6 vendors · 20 products

References

9 links