An issue was discovered in Dovecot before 2.3.13.
Priority LOW 35Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 2 fixed, 4 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages (and path disclosure).
Why it matters now
EPSS 0.02784 86th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 2 fixed, 4 without a fix
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 · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* | 2.2.26 to before 2.3.13 | Vulnerable | The Dovecot Project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
- cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* Versions 2.2.26 to before 2.3.13 Vulnerable ·The Dovecot Project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
Remediation
Red Hat 1 advisory
- RHSA-2021:1887 Released 2021-05-18 · Red Hat rating Moderatedovecot security and bug fix update
- Red Hat CodeReady Linux Builder (v. 8) dovecot-1:2.3.8-9.el8, dovecot-devel-1:2.3.8-9.el8
- Red Hat Enterprise Linux AppStream (v. 8) dovecot-1:2.3.8-9.el8, dovecot-mysql-1:2.3.8-9.el8, dovecot-pgsql-1:2.3.8-9.el8 +1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2021:1887 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2021:1887 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-24386
- 2026-10-03 Alias added: GHSA-jp3r-27f3-r855
References
Advisory 9
- https://dovecot.org/security
- http://www.openwall.com/lists/oss-security/2021/01/04/4
- https://dovecot.org/pipermail/dovecot-news/2021-January/000450.html
- https://doc.dovecot.org/configuration_manual/hibernation/
- DSA-4825
- 20210106 CVE-2020-24386: IMAP hibernation allows accessing other peoples mail
- http://packetstormsecurity.com/files/160842/Dovecot-2.3.11.3-Access-Bypass.html
- GLSA-202101-01
- FEDORA-2021-c90cb486f7
Sources
- CVE-2020-24386 · CVE Program
- CVE-2020-24386 · NVD
- FIRST EPSS
- GHSA-jp3r-27f3-r855 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-24386 · Red Hat security data · CC BY 4.0
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