8.6

CVE-2025-40776: isc bind 9

CVSS: 8.6v3.1HighDeferred
AliasesALPINE-CVE-2025-40776CGA-3fp3-gmhr-ghgmCGA-c92r-h34p-2fpj
Published 16-07-2025Last modified 22-07-2025
Open JSON

Vulnerability summary

CVE-2025-40776 is a high (CVSS 8.6) vulnerability in isc bind 9. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.6% 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
0.23%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-JPV5-VVG9-C274CGA-P8MP-VX25-VP7R

Timeline

  1. 16-07-2025
    PublishedVulnerability first disclosed.
  2. 22-07-2025
    Last modifiedVulnerability information updated.

Description

A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

+0.02 pp

From 0.21% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.23%

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

Alpine1 product
  • bind< 9.20.11-r0
Chainguard1 product
  • bind-dnssec-rootAll versions (No fix recorded)
Isc1 product
  • bind 9≥ 9.11.3-S1, ≤ 9.16.50-S1 | ≥ 9.18.11-S1, ≤ 9.18.37-S1 | ≥ 9.20.9-S1, ≤ 9.20.10-S1
Wolfi1 product
  • bind-dnssec-rootAll versions (No fix recorded)

4 vendors · 4 products

References

2 links