9.8

CVE-2022-44640: heimdal_project heimdal Double Free

Modified
AliasesALPINE-CVE-2022-44640UBUNTU-CVE-2022-44640DEBIAN-CVE-2022-44640
Published 25-12-2022Last modified 15-04-2025

Vulnerability summary

CVE-2022-44640 is a critical (CVSS 9.8) Double Free vulnerability in heimdal_project heimdal. EPSS estimates a 2.35% chance of exploitation in the next 30 days, higher than 83.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
2.35%
0%100%
Low · +0.50 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 4
DLA-3206-1DSA-5287-1MGASA-2022-0468OPENSUSE-SU-2023:0019-1OPENSUSE-SU-2023:0020-1OPENSUSE-SU-2024:12587-1

Timeline

  1. 25-12-2022
    PublishedVulnerability first disclosed.
  2. 15-04-2025
    Last modifiedVulnerability information updated.

Description

Heimdal before 7.7.1 allows remote attackers to execute arbitrary code because of an invalid free in the ASN.1 codec used by the Key Distribution Center (KDC).

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

2.35%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

Increase +0.50 pp

From 1.84% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
  • heimdal< 7.8.git20221115.a6cf945+dfsg-1
  • samba< 2:4.17.4+dfsg-1
Alpine1 product
  • heimdal< 7.7.1-r0
Heimdal_project1 product
Samba1 product
  • samba≥ 4.15.0, < 4.15.3 | ≥ 4.16.0, < 4.16.8 | ≥ 4.17.0, < 4.17.4
Ubuntu1 product
  • heimdal< 1.6~git20131207+dfsg-1ubuntu1.2+esm3 | < 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3 | < 7.5.0+dfsg-1ubuntu0.3 | < 7.7.0+dfsg-1ubuntu1.3 | All versions (No fix recorded)

5 vendors · 6 products

References

9 links