7.8

CVE-2020-28007: exim Link Following

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2020-28007DEBIAN-CVE-2020-28007
Published 06-05-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-28007 is a high (CVSS 7.8) Link Following vulnerability in exim. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.6% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.53%
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 allows Execution with Unnecessary Privileges. Because Exim operates as root in the log directory (owned by a non-root user), a symlink or hard link attack allows overwriting critical root-owned files anywhere on the filesystem.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

0.00 pp

From 0.53% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.53%

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