CVE-2022-3736Network attack vector

Remote resolver crash via stale-cache RRSIG query

Published Jan 25, 2023 · Updated Apr 1, 2025

Denial of service in ISC BIND 9 affected releases allows remote attackers to crash the named resolver with a crafted RRSIG query. The stale-answer-client-timeout implementation reaches an assertion failure while processing the query against stale cache data. Affected releases are 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1; exploitation requires stale cache and stale answers enabled with a positive timeout value.

CVSS severity7.5
High
EPSS probability48.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in ISC BIND 9 affected releases allows remote attackers to crash the named resolver with a crafted RRSIG query. The stale-answer-client-timeout implementation reaches an assertion failure while processing the query against stale cache data. Affected releases are 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1; exploitation requires stale cache and stale answers enabled with a positive timeout value.

The record

CVE
CVE-2022-3736
Published
Jan 25, 2023
Updated
Apr 1, 2025
Vendor
Internet Systems Consortium
Product
BIND 9
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.16.12 <=9.16.36
  2. Affected versionversion=9.16.12-S1 <=9.16.36-S1
  3. Affected versionversion=9.18.0 <=9.18.10
  4. Affected versionversion=9.19.0 <=9.19.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Internet Systems Consortium · BIND 9version=9.16.12 <=9.16.36; version=9.16.12-S1 <=9.16.36-S1; version=9.18.0 <=9.18.10; version=9.19.0 <=9.19.8

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Internet Systems ConsortiumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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