Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28021
High 8.8
In plain English
A high-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 4.1% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)4.1%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 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28021 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28021 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28021 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28021 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28021 |
| Debian:12 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28021 |
| Debian:13 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28021 |
| Debian:14 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28021 |