Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28026
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 9.3% (higher than 95% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)9.3%top 4.6% 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, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28026 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28026 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28026 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28026 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28026 |
| Debian:12 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28026 |
| Debian:13 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28026 |
| Debian:14 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28026 |