Use After Free in Exim
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.565 (99.1th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.568 · newest: 0.565 · change: -0.003
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txt (Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/05/11/5 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/11/6 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/11/17 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/11/15 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/11/14 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/12/2 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/05/12/3 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-28018?
- CVE-2020-28018 is a critical-severity vulnerability in Exim, classified under Use After Free. CVSS score: 9.8/10. Published 2021-05-06.
- How severe is CVE-2020-28018?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-28018 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.