Skip to content
CVE Tracker
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2025-40778

Cache poisoning attacks with unsolicited RRs

High8.6EPSS 0.67%
Published
Updated
Reserved
Assigned by
isc

Description

Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 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, 9.11.3-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

CVSS scores of CVE-2025-40778, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVDNVD · Deferred3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.67% · top 48% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

Affected products

  • ISC · BIND 9

    • affected 9.11.0 – ≤ 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 9.11.3-S1 – ≤ 9.16.50-S1
    • affected 9.18.11-S1 – ≤ 9.18.39-S1
    • affected 9.20.9-S1 – ≤ 9.20.13-S1

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.41, 9.20.15, 9.21.14, 9.18.41-S1, or 9.20.15-S1.

Workaround: No workarounds known.

Exploitation: We are not aware of any active exploits.

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2025-40778 badge
[![CVE-2025-40778](https://trackcve.app/badge/CVE-2025-40778.svg)](https://trackcve.app/cve/CVE-2025-40778)

Record last updated .