Integer overflow in Exim

CVE-2020-28020

Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.

Vulnerability class: Integer Overflow

EPSS: 0.079 (94.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Exim
  • N/a — versions n/a

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28020?
CVE-2020-28020 is a critical-severity vulnerability in Exim, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2021-05-06.
How severe is CVE-2020-28020?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-28020 known to be exploited?
5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.