CVE-2022-44640

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).

Published: 2022-12-25 Last update: 2025-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-44640 is rated High Risk (66.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.84%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-44640

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.61% 1.84% +0.23%
2 2026-06-03 1.19% 1.61% +0.42%
3 2026-05-15 — 1.19% —

Full EPSS history (34 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-44640

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2022-44640

OS Trackers for CVE-2022-44640

vendor priority summary link
alpine — CVE-2022-44640: 1 source package rows (heimdal); 22 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 15. https://security.alpinelinux.org/vuln/CVE-2022-44640
debian not yet assigned CVE-2022-44640 not yet assigned priority: Debian including 2 source packages (heimdal, samba), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 9, open 1. https://security-tracker.debian.org/tracker/CVE-2022-44640
gentoo high CVE-2022-44640: 1 GLSA(s) (202310-06), 1 atom(s) (app-crypt/heimdal); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-44640
ubuntu medium CVE-2022-44640 medium priority: Ubuntu including 2 source packages (heimdal, samba), 26 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 12, released 6, ignored 5, needed 3. https://ubuntu.com/security/CVE-2022-44640

Affected software / configurations for CVE-2022-44640

Vendor Product Version Raw CPE
heimdal_project heimdal < 7.7.1 cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:*
samba samba >= 4.15.0, < 4.15.3 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
samba samba >= 4.16.0, < 4.16.8 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
samba samba >= 4.17.0, < 4.17.4 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*

References for CVE-2022-44640

cvelogic Threat Intelligence