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No exploitation reportedFix available

CVE-2020-10958

No exploitation reported by the sources we read.

  • Published2020-05-18
  • Fixed in2.3.10.1
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.

Timeline

dates in UTC
  1. 2020-05-1814:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-10958?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-10958?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Dovecot
BranchAffectedFixed in
2.3< 2.3.10.12.3.10.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dovecotAlmaLinux:8all versions · fixed in 1:2.3.8-4.el8and 1 other package

Vendor advisories

  • CVE-2020-10958 Red Hat Product Security96 products fixed

    dovecot: command followed by sufficient number of newlines leads to use-after-free

  • RHSA-2020:4763 Red Hat Product Security68 products fixed

    Red Hat Security Advisory: dovecot security update

Full record on NVD

Fix

  1. Update Dovecot to 2.3.10.1
  2. Vendor fix Red Hat Product Security RHSA-2020:4763 · 68 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.15.3read 2026-10-23
  • CNACVSS 3.05.3read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-416read 2026-10-23
  • FIRST EPSSEPSS score6.1 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2020-05-18
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-10958?

In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.

Is CVE-2020-10958 actively exploited?

Active exploitation of CVE-2020-10958 has not been confirmed. Its EPSS score was 6.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-10958?

CVE-2020-10958 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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