What is CVE-2020-28017?

CVE-2020-28017 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-2020-28017?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-28017 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Exim

CVE-2020-28017

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.

Vulnerability class: Integer Overflow

EPSS: 0.366 (98.3th 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)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-28017?: CVE-2020-28017 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-2020-28017?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-28017 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.