CVE-2022-42898Network attack vector

Service crashes and code execution via PAC overflows

Published Dec 25, 2022 · Updated Apr 14, 2025

PAC parsing integer overflows in MIT Kerberos 5 before 1.19.4 and 1.20.x before 1.20.1 allow remote authenticated users to crash services. In krb5_pac_parse, attacker-controlled buffer counts and offset-plus-length values wrap during header, allocation, and bounds calculations, causing out-of-bounds reads or undersized allocations followed by heap writes. A principal key can reach a KDC or kadmind; application-server exploitation requires its service key, code execution is limited to 32-bit platforms, and Heimdal before 7.7.1 has a related service-crash flaw.

CVSS severity8.8
High
EPSS probability6.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PAC parsing integer overflows in MIT Kerberos 5 before 1.19.4 and 1.20.x before 1.20.1 allow remote authenticated users to crash services. In krb5_pac_parse, attacker-controlled buffer counts and offset-plus-length values wrap during header, allocation, and bounds calculations, causing out-of-bounds reads or undersized allocations followed by heap writes. A principal key can reach a KDC or kadmind; application-server exploitation requires its service key, code execution is limited to 32-bit platforms, and Heimdal before 7.7.1 has a related service-crash flaw.

The record

CVE
CVE-2022-42898
Published
Dec 25, 2022
Updated
Apr 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1210, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.4SambaCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
8.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1210Exploitation of Remote Services
T1499.004Application or System Exploitation

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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