Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28022
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 3.0% (higher than 87% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)3.0%top 12.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC
Official description
Exim 4 before 4.94.2 has Improper Restriction of Write Operations within the Bounds of a Memory Buffer. This occurs when processing name=value pairs within MAIL FROM and RCPT TO commands.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28022 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28022 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28022 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28022 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28022 |
| Debian:12 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28022 |
| Debian:13 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28022 |
| Debian:14 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28022 |