CVE-2020-28018
Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 56.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 56.47% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- exim/exim
- Source
- cve@mitre.org
EPSS 56.5% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/05/11/14Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/15Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/17Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/5Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/6Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/12/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/12/3Mailing List, Third Party Advisory
- https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/14Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/15Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/17Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/5Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/11/6Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/12/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/12/3Mailing List, Third Party Advisory
- https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.