CVE-2020-24386
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 2.78% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 85.8% of scored records. A rank, not a probability.
- NVD base score
- 6.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-01-04 16:25Z5 YR AGO
- Last updated
- 2024-08-04 15:12Z2 YR AGO
- Reserved
- 2020-08-19
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-138Improper Neutralization of Special ElementsClass
- Data version
- 5.1
- Document digest
- ec73d962a4ccb354cd3e9c2466c874166b42eaebe608bcc1ecf1288ac00fc369
05 Affected products
06 References
- dovecot.orghttps://dovecot.org/security
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2021/01/04/4
- dovecot.orghttps://dovecot.org/pipermail/dovecot-news/2021-January/000450.html
- doc.dovecot.orghttps://doc.dovecot.org/configuration_manual/hibernation/
- www.debian.orgDSA-4825https://www.debian.org/security/2021/dsa-4825
- seclists.org20210106 CVE-2020-24386: IMAP hibernation allows accessing other peoples mailhttp://seclists.org/fulldisclosure/2021/Jan/18
- packetstormsecurity.comhttp://packetstormsecurity.com/files/160842/Dovecot-2.3.11.3-Access-Bypass.html
- security.gentoo.orgGLSA-202101-01https://security.gentoo.org/glsa/202101-01
- lists.fedoraproject.orgFEDORA-2021-c90cb486f7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7/
07 Fixed in
AlmaLinux 8
- dovecot Fixed in 1:2.3.8-9.el8
- dovecot-devel Fixed in 1:2.3.8-9.el8
- dovecot-mysql Fixed in 1:2.3.8-9.el8
- dovecot-pgsql Fixed in 1:2.3.8-9.el8
- dovecot-pigeonhole Fixed in 1:2.3.8-9.el8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- dovecot Fixed in 2.3.13-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- dovecot Fixed in 1:2.3.8-9.el8
- dovecot-devel Fixed in 1:2.3.8-9.el8
- dovecot-mysql Fixed in 1:2.3.8-9.el8
- dovecot-pgsql Fixed in 1:2.3.8-9.el8
- dovecot-pigeonhole Fixed in 1:2.3.8-9.el8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- dovecot Fixed in 1:2.3.13+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- dovecot Fixed in 1:2.3.13+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- dovecot Fixed in 1:2.3.13+dfsg1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- dovecot Fixed in 1:2.2.33.2-1ubuntu4.7
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- dovecot Fixed in 1:2.3.7.2-1ubuntu3.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.