CVE-2020-24386

Name: CVE-2020-24386
Creator: NVD / NIST
Published: 2021-01-04T17:15:13.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 2.75%

Last modified Jun 17, 2026

CVE-2020-24386 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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).. EPSS estimates a 2.75% chance of exploitation in the next 30 days.

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 messages (and path disclosure).

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

2.75%

84.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Dovecot	Dovecot	>= 2.2.26, < 2.3.13
Debian	Debian Linux	10.0
Fedoraproject	Fedora	32

References

http://packetstormsecurity.com/files/160842/Dovecot-2.3.11.3-Access-Bypass.htmlMailing List, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jan/18Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/01/04/4Mailing List, Third Party Advisory
https://doc.dovecot.org/configuration_manual/hibernation/Vendor Advisory
https://dovecot.org/pipermail/dovecot-news/2021-January/000450.htmlMailing List, Vendor Advisory
https://dovecot.org/securityVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7/
https://security.gentoo.org/glsa/202101-01Third Party Advisory
https://www.debian.org/security/2021/dsa-4825Third Party Advisory
http://packetstormsecurity.com/files/160842/Dovecot-2.3.11.3-Access-Bypass.htmlMailing List, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jan/18Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/01/04/4Mailing List, Third Party Advisory
https://doc.dovecot.org/configuration_manual/hibernation/Vendor Advisory
https://dovecot.org/pipermail/dovecot-news/2021-January/000450.htmlMailing List, Vendor Advisory
https://dovecot.org/securityVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7/
https://security.gentoo.org/glsa/202101-01Third Party Advisory
https://www.debian.org/security/2021/dsa-4825Third Party Advisory

Timeline

Published: Jan 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24386?

How severe is CVE-2020-24386?

CVE-2020-24386 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 2.75% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24386?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24386?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST