Vulnerability · Published May 6, 2021 · Assigned by mitre
CVE-2020-28017
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 36.6% (higher than 99% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)36.6%top 1.5% 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 Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28017 |
| Alpine:v3.21 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28017 |
| Alpine:v3.22 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28017 |
| Alpine:v3.23 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28017 |
| Alpine:v3.24 | exim | 4.94.2-r0 | ALPINE-CVE-2020-28017 |
| Debian:12 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28017 |
| Debian:13 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28017 |
| Debian:14 | exim4 | 4.94.2-1 | DEBIAN-CVE-2020-28017 |