CVE-2020-28018

Home/CVE/Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSS

CVE

Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSS

Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.

CRITICAL · CVSS 9.8 EPSS 0.65912

Act now

EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
EPSS percentile: top 1% of all CVEs by exploitation likelihood
CVSS base score ≥ 7.0

Sigma rules0 YARA rules0

⬡

Weakness Classification

CWE-416Use After Free

▤

Affected Products & Versions

exim>= 4.90 and < 4.94.2

▣

Scoring & Timeline

9.8

CRITICAL · CVSS v3.1 · cve@mitre.org

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD06 May 2021 · 01:15 PM

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

⚑

Vendor Advisories

suse-csafopenSUSE-SU-2024:10746-1
suse-csafopenSUSE-SU-2021:0753-1
suse-csafopenSUSE-SU-2021:0754-1
suse-csafopenSUSE-SU-2021:0677-1
usnUSN-4934-1

🔗

References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

http://www.openwall.com/lists/oss-security/2021/05/11/14Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/11/15Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/11/17Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/11/5Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/11/6Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/05/12/2Mailing ListThird Party Advisory

Show all 8 references

http://www.openwall.com/lists/oss-security/2021/05/12/3Mailing ListThird Party Advisory

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtVendor Advisory

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