In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or…
Priority LOW 35CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by sending mail with an empty localpart.
Why it matters now
EPSS 0.08153 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* | before 2.3.10.1 | Vulnerable | The Dovecot Project |
- cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* Versions before 2.3.10.1 Vulnerable ·The Dovecot Project
Remediation
Red Hat 1 advisory
- RHSA-2020:4763 Released 2020-11-04 · Red Hat rating Moderatedovecot security update
- Red Hat CodeReady Linux Builder (v. 8) dovecot-1:2.3.8-4.el8, dovecot-devel-1:2.3.8-4.el8
- Red Hat Enterprise Linux AppStream (v. 8) dovecot-1:2.3.8-4.el8, dovecot-mysql-1:2.3.8-4.el8, dovecot-pgsql-1:2.3.8-4.el8 +1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2020:4763 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:4763 |
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2020-10967
- 2026-10-03 Alias added: GHSA-qm25-rqq9-7jcr
References
Advisory 11
- https://dovecot.org/security
- https://www.openwall.com/lists/oss-security/2020/05/18/1
- [oss-security] 20200518 Multiple vulnerabilities in Dovecot IMAP server
- USN-4361-1
- DSA-4690
- FEDORA-2020-1dee17d880
- openSUSE-SU-2020:0720
- FEDORA-2020-b60344c987
- FEDORA-2020-cd8b8f887b
- FEDORA-2020-b8ebc4201e
- FEDORA-2020-d737c57172
More The Dovecot Project Dovecot vulnerabilities
- TI-2019-08591 In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2)… CVSS 3.0CRITICAL 9.8
- TI-2020-05686 lib-smtp in submission-login and lmtp in Dovecot 2.3.9 before 2.3.9.3 mishandles… CVSS 3.1HIGH 7.5
- TI-2016-07114 The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a… CVSS 3.0MEDIUM 5.9
- TI-2017-10567 Out-of-bounds read in Dovecot CVSS 3.0HIGH 7.1
- TI-2022-12706 An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. CVSS 3.1HIGH 8.8
- TI-2020-08835 In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP… CVSS 3.1HIGH 7.5
Sources
- CVE-2020-10967 · CVE Program
- CVE-2020-10967 · NVD
- FIRST EPSS
- GHSA-qm25-rqq9-7jcr · GitHub Advisory Database · CC BY 4.0
- CVE-2020-10967 · Red Hat security data · CC BY 4.0
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