7.5

CVE-2025-40779: isc kea NULL Pointer Dereference

CVSS: 7.5v3.1HighDeferred
AliasesRHSA-2025:21006UBUNTU-CVE-2025-40779openSUSE-SU-2025:15499-1
Published 27-08-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-40779 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in isc kea. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-08-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

If a DHCPv4 client sends a request with some specific options, and Kea fails to find an appropriate subnet for the client, the `kea-dhcp4` process will abort with an assertion failure. This happens only if the client request is unicast directly to Kea; broadcast messages do not cause the problem. This issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

+0.03 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat11 products
  • kea< 0:3.0.1-1.el10_1
  • kea-debuginfo< 0:3.0.1-1.el10_1
  • kea-debugsource< 0:3.0.1-1.el10_1
  • kea-devel-debuginfo< 0:3.0.1-1.el10_1
  • kea-doc< 0:3.0.1-1.el10_1
Opensuse2 products
  • kea&distro=openSUSE Leap 16.0< 3.0.1-160000.1.1
  • kea&distro=openSUSE Tumbleweed< 3.0.1-1.1
Debian1 product
  • isc-keaAll versions (No fix recorded)
Isc1 product
  • kea≥ 2.7.1, ≤ 2.7.9 | 3.0.0 | 3.1.0
Ubuntu1 product
  • isc-keaAll versions (No fix recorded)

5 vendors · 16 products

References

15 links
Show all 15 references