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CVE-2022-37451

26
FAUCET Score

CVE-2022-37451 is an invalid free vulnerability in Exim versions prior to 4.96, specifically within the pam_converse function, affecting Exim and Fedora distributions. It carries a CVSS score of 7.5 (HIGH) due to its network-based attack vector, low attack complexity, and potential for high availability impact. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the vulnerability's nature warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.96CPE matchmatch criteria
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.60%
Probability of exploitation in next 30 days
EPSS Percentile
83.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0260 is in the 71st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2022-37451Moderate

Exim: Exim before 4.96 has an invalid free in pam_converse

Aug 6, 2022

References

cwe.mitre.org / data/definitions/762.html
Third Party Advisory
github.com / Exim/exim/commit/51be321b27825c01829dffd90f11bfff256f7e42
PatchThird Party Advisory
github.com / Exim/exim/compare/exim-4.95...exim-4.96
Release NotesThird Party Advisory
github.com / Exim/exim/wiki/EximSecurity
Release NotesThird Party Advisory
github.com / ivd38/exim_invalid_free
ExploitPatchThird Party Advisory
lists.exim.org / lurker/message/20220625.141825.d6de6074.en.html
Mailing ListRelease NotesVendor Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LETR5CVDPFOFQHXCJP6NFLG52JZHQYDY
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/XSWDF4QEXD4TDWQLYQOWCHBJKTDQR4Z7
exim.org / static/doc/security
Vendor Advisory
openwall.com / lists/oss-security/2022/08/06/1
Mailing ListThird Party Advisory