Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28020
Critical 9.8
In plain English
A critical-severity security flaw in the exim package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 7.9% (higher than 95% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)7.9%top 5.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28020 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28020 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28020 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28020 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28020 |
| Debian:12 | exim4 | 4.92~RC5-1 | DEBIAN-CVE-2020-28020 |
| Debian:13 | exim4 | 4.92~RC5-1 | DEBIAN-CVE-2020-28020 |
| Debian:14 | exim4 | 4.92~RC5-1 | DEBIAN-CVE-2020-28020 |
Affected products (as reported)
References
- https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28020-HSIZE.txt x_refsource_MISC
- [oss-security] 20210725 CVE-2020-28020: Integer overflow in Exim that can lead to RCE: Some questions to the Qualys researchers who designed the exploit mailing-list, x_refsource_MLIST
- [oss-security] 20210802 Re: CVE-2020-28020: Integer overflow in Exim that can lead to RCE: Some questions to the Qualys researchers who designed the exploit mailing-list, x_refsource_MLIST