In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP…
Priority MEDIUM 43CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
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.
Why it matters now
EPSS 0.07167 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-2020:2901 Released 2020-07-13 · Red Hat rating Importantdovecot security update
- Red Hat CodeReady Linux Builder (v. 8) dovecot-1:2.3.8-2.el8_2.1, dovecot-devel-1:2.3.8-2.el8_2.1
- Red Hat Enterprise Linux AppStream (v. 8) dovecot-1:2.3.8-2.el8_2.1, dovecot-mysql-1:2.3.8-2.el8_2.1, dovecot-pgsql-1:2.3.8-2.el8_2.1 +1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2020:2901 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:2901 |
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-2020-10957
- 2026-10-03 Alias added: GHSA-q55g-848v-f654
References
Advisory 8
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-2020-10078 In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth… CVSS 3.1HIGH 7.5
Sources
- CVE-2020-10957 · CVE Program
- CVE-2020-10957 · NVD
- FIRST EPSS
- GHSA-q55g-848v-f654 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-10957 · Red Hat security data · CC BY 4.0
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