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Integer OverflowWeakness · CWE-190

CVE-2025-24528

HIGH · 7.1 CVSS v3.1 Published 2026-01-16
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
77/100
Remediation priority · High
Remotely reachable Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() in kdb_log.c. An authenticated attacker can cause an out-of-bounds write and kadmind daemon crash.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

MIT Kerberos 5 version 1.22 or later

  1. Identify the current installed version of MIT krb5 using: dpkg -l | grep krb5 or rpm -qa | grep krb5
  2. For Debian/Ubuntu: Run sudo apt-get update && sudo apt-get install krb5-kdc krb5-admin-server to upgrade to the latest available version in your distribution's repositories
  3. For Red Hat/CentOS: Run sudo yum update krb5-server to apply the update
  4. Alternatively, build from source: Download krb5-1.22 or later from https://web.mit.edu/kerberos/dist/index.html
  5. Configure, compile, and install following the instructions in the MIT Kerberos build guide
  6. Restart the kadmind daemon after upgrade: sudo systemctl restart kadmind or sudo service kadmind restart
  7. Verify the running version is 1.22 or later: krb5-config --version

Generated from the published advisory — verify against the referenced sources before acting.

We can apply and verify the patch for your build — typical engagement from $3,200. Get the patch applied

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-24528 in production — separate from our analysis above.

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