9.8

CVE-2020-28022: exim Out-of-bounds Write

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2020-28022DEBIAN-CVE-2020-28022
Published 06-05-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-28022 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in exim. EPSS estimates a 3.02% chance of exploitation in the next 30 days, higher than 87.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
3.02%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 6
DLA-2650-1DSA-4912-1OPENSUSE-SU-2021:0677-1OPENSUSE-SU-2021:0753-1OPENSUSE-SU-2021:0754-1OPENSUSE-SU-2024:10746-1

Timeline

  1. 06-05-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.02%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 3.02% on 19-09-2026

19-09-202619-10-2026
EPSS score
3.02%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • exim4< 4.94.2-1
Exim1 product
  • exim≥ 4.00, < 4.94.2
Ubuntu1 product
  • exim4< 4.82-3ubuntu2.4+esm3 | < 4.86.2-2ubuntu2.6+esm1 | < 4.90.1-1ubuntu1.8 | < 4.93-13ubuntu1.5

3 vendors · 3 products

References

6 links