Exim before 4.96 has an invalid free in pam_converse in auths/call_pam.c because…
Priority LOW 39CWE-763Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Exim before 4.96 has an invalid free in pam_converse in auths/call_pam.c because store_free is not used after store_malloc.
Why it matters now
EPSS 0.03292 88th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* | before 4.96 | Vulnerable | Exim |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* | 36 | Vulnerable | Fedoraproject |
- cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* Versions before 4.96 Vulnerable ·Exim
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-37451
- 2026-10-03 Alias added: GHSA-968g-c3p8-6hvf
References
Advisory 8
- https://github.com/Exim/exim/wiki/EximSecurity
- https://www.exim.org/static/doc/security/
- https://www.openwall.com/lists/oss-security/2022/08/06/1
- https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html
- https://cwe.mitre.org/data/definitions/762.html
- https://github.com/Exim/exim/compare/exim-4.95...exim-4.96
- FEDORA-2022-1ca1d22165
- FEDORA-2022-f9a8388e62
Sources
- CVE-2022-37451 · CVE Program
- CVE-2022-37451 · NVD
- FIRST EPSS
- GHSA-968g-c3p8-6hvf · GitHub Advisory Database · CC BY 4.0
- CVE-2022-37451 · Red Hat security data · CC BY 4.0
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