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No exploitation reportedFix available

CVE-2020-10957

No exploitation reported by the sources we read.

  • Published2020-05-18
  • Fixed in2.3.10.1
  • WeaknessCWE-476

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, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp.

Timeline

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

Observed activity

isMalicious corpus · updated 2026-11-03 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-2020-10957?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-10957?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

  • dovecotUbuntu:20.04:LTSall versions · fixed in 1:2.3.7.2-1ubuntu3.1
  • dovecotRed Hat:enterprise_linux:8::crball versions · fixed in 1:2.3.8-2.el8_2.1and 6 other packages
  • dovecotRed Hat:enterprise_linux:8::appstreamall versions · fixed in 1:2.3.8-2.el8_2.1and 8 other packages
  • dovecotMageia:7all versions · fixed in 2.3.10.1-1.mga7
  • dovecotDebian:14all versions · fixed in 1:2.3.10.1+dfsg1-1
  • dovecotDebian:13all versions · fixed in 1:2.3.10.1+dfsg1-1
  • dovecotDebian:12all versions · fixed in 1:2.3.10.1+dfsg1-1
  • dovecotDebian:10all versions · fixed in 1:2.3.4.1-5+deb10u2

26 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-10957 Red Hat Product Security96 products fixed

    dovecot: malformed NOOP commands leads to DoS

  • RHSA-2020:2901 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-2020:2901 · 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
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.07.5known since 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score7.2 %2026-11-03
  • OSVaffected packages—

Identifiers

Technical details

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

Frequently asked questions

What is CVE-2020-10957?

In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp.

Is CVE-2020-10957 actively exploited?

Active exploitation of CVE-2020-10957 has not been confirmed. Its EPSS score was 7.2% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-10957?

CVE-2020-10957 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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