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CVE-2024-12705

DNS-over-HTTPS implementation suffers from multiple issues under heavy query load

High7.5EPSS 18.6%
Published
Updated
Reserved
Assigned by
isc

Description

Clients using DNS-over-HTTPS (DoH) can exhaust a DNS resolver's CPU and/or memory by flooding it with crafted valid or invalid HTTP/2 traffic. This issue affects BIND 9 versions 9.18.0 through 9.18.32, 9.20.0 through 9.20.4, 9.21.0 through 9.21.3, and 9.18.11-S1 through 9.18.32-S1.

Timeline

  1. ID reserved

    By isc

  2. · 43 days later

    Published

  3. · 9 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-2024-12705, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Deferred3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
18.6% · top 2.7% of all CVEs (7 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 7.5.

Weakness

Affected products

  • ISC · BIND 9

    • affected 9.18.0 – ≤ 9.18.32
    • affected 9.20.0 – ≤ 9.20.4
    • affected 9.21.0 – ≤ 9.21.3
    • affected 9.18.11-S1 – ≤ 9.18.32-S1

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.33, 9.20.5, 9.21.4, or 9.18.33-S1.

Workaround: The issue affects only the DNS-over-HTTPS protocol and does not apply to instances where DoH is not enabled.

Exploitation: We are not aware of any active exploits.

References (2)

Sources

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

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Record last updated .