Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28024
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 4.2% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)4.2%top 9.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28024 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28024 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28024 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28024 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28024 |
| Debian:12 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28024 |
| Debian:13 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28024 |
| Debian:14 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28024 |