CVE-2022-3080Network attack vector

Resolver crash via stale CNAME query handling

Published Sep 21, 2022 · Updated Sep 17, 2024

Denial of service in affected ISC BIND 9 releases allows remote attackers to crash named by sending crafted DNS queries to a resolver. The stale-answer path mishandles an incoming query when the cache contains a stale CNAME and stale-answer-client-timeout is 0. Exploitation requires stale cache and stale answers to be enabled; the resulting named process crash interrupts DNS service.

CVSS severity7.5
High
EPSS probability1.64%
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 affected ISC BIND 9 releases allows remote attackers to crash named by sending crafted DNS queries to a resolver. The stale-answer path mishandles an incoming query when the cache contains a stale CNAME and stale-answer-client-timeout is 0. Exploitation requires stale cache and stale answers to be enabled; the resulting named process crash interrupts DNS service.

The record

CVE
CVE-2022-3080
Published
Sep 21, 2022
Updated
Sep 17, 2024
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-74, CWE-613, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=35
  2. Affected versionversion=36
  3. Affected versionversion=37

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora Linuxversion=35; version=36; version=37
Internet Systems Consortium · BIND 9version=9.16.14; version=9.16.14 <9.16.33; version=9.16.21; version=9.16.32; version=9.18.0 <9.18.7; version=9.19.0 <9.19.5; version=Development Branch 9.19 9.19.0 through versions before 9.19.5; version=Open Source Branch 9.16 9.16.14 through versions before 9.16.33; version=Open Source Branch 9.18 9.18.0 through versions before 9.18.7; version=Supported Preview Branch 9.16-S 9.16.14-S1 through versions before 9.16.33-S1

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-613Insufficient Session Expiration
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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