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CVE-2022-0396

DoS from specifically crafted TCP packets

Medium5.3EPSS 2.7%
Published
Updated
Reserved
Assigned by
isc

Description

BIND 9.16.11 -> 9.16.26, 9.17.0 -> 9.18.0 and versions 9.16.11-S1 -> 9.16.26-S1 of the BIND Supported Preview Edition. Specifically crafted TCP streams can cause connections to BIND to remain in CLOSE_WAIT status for an indefinite period of time, even after the client has terminated the connection.

Scores

CVSS scores of CVE-2022-0396, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Modified3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS (exploitation in 30 days)
2.7% · top 14% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

  • ISC recently discovered an issue in BIND that allows TCP connection slots to be consumed for an indefinite time frame via a specifically crafted TCP stream sent from a client. This issue is present in BIND. BIND 9.16.11 -> 9.16.26, 9.17.0 -> 9.18.0 and versions 9.16.11-S1 -> 9.16.26-S1 of the BIND Supported Preview Edition. 9.16.11 to 9.16.26 (including S editions), and 9.18.0. This issue can only be triggered on BIND servers which have keep-response-order enabled, which is not the default configuration. The keep-response-order option is an ACL block; any hosts which are specified within it will be able to trigger this issue on affected versions. BIND 9.16.11 -> 9.16.26, 9.17.0 -> 9.18.0 and versions 9.16.11-S1 -> 9.16.26-S1 of the BIND Supported Preview Edition.
  • CWE-404 (opens in a new tab)All about CWE-404 and its CVEs

Affected products

  • ISC · BIND

    • affected Open Source Branch 9.16 9.16.11 through versions before 9.16.27
    • affected Development Branch 9.17 BIND 9.17 all versions
    • affected Open Source Branch 9.18 9.18.0
    • affected Supported Preview Branch 9.16-S 9.16.11-S through versions before 9.16.27-S

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND: 9.16.27 9.18.1 BIND Supported Preview Edition is a special feature-preview branch of BIND provided to eligible ISC support customers. 9.16.27-S1

Workaround: To mitigate this issue in all affected versions of BIND, use the default setting of keep-response-order { none; }. Active exploits: We are not aware of any active exploits.

References (5)

Sources

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

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Record last updated .