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CVE-2025-40780Cache poisoning due to weak PRNG

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.

Timeline

  1. ID reserved

    By isc

  2. · 6 months later

    Published

  3. · 13 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-40780, 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)
0.47% · top 59% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · 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.

Affected products

  • 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
    • 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

References2

Sources

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

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Record last updated .