CVE-2025-24528
Published: 16 January 2026
Summary
CVE-2025-24528 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability. Its CVSS base score is 7.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 43.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and CM-7 (Least Functionality).
Deeper analysis
CVE-2025-24528 is an integer overflow vulnerability (CWE-190) in MIT Kerberos 5 (krb5) versions before 1.22 when incremental propagation is enabled. The flaw resides in the resize() function within kdb_log.c, where a large update size triggers the overflow, enabling an out-of-bounds write that crashes the kadmind daemon.
An attacker with low privileges (PR:L) who has network access (AV:N) can exploit this remotely, though it requires high attack complexity (AC:H) and no user interaction (UI:N). Successful exploitation leads to a kadmind daemon crash, with a CVSS v3.1 base score of 7.1 (AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H), resulting in low integrity impact, high availability disruption, and changed scope.
Mitigation requires upgrading to krb5 1.22 or later, as detailed in the fixing commit (78ceba024b64d49612375be4a12d1c066b0bfbd0) and the release comparison between krb5-1.21.3-final and krb5-1.22-final on the krb5 GitHub repository. Debian LTS has issued an announcement with corresponding patches.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2883
Vulnerability details
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Integer overflow triggers out-of-bounds write and kadmind crash, directly enabling application exploitation for endpoint DoS.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires applying the vendor patch that eliminates the integer overflow in resize() of kdb_log.c.
Memory-protection mechanisms can block or contain the out-of-bounds write that results from the overflow.
Disabling incremental propagation removes the vulnerable code path until the fix is applied.