CVE-2020-10957 Null dereference in n/a

High 7.5 Published 18 May 2020 Updated 4 Aug 2024

Unauthenticated attackers can crash Dovecot services by sending malformed NOOP commands, causing a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-10957?

CVE-2020-10957 is a high-severity vulnerability in Dovecot Dovecot, published on 18 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-476

Which versions are affected by CVE-2020-10957?

It affects 1 product.

Linux distribution packages (16)

`dovecot` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-debugsource` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-mysql` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-mysql-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pgsql` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pgsql-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pigeonhole` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pigeonhole-debuginfo` Red Hat:enterprise_linux:8::appstream	All versions	`1:2.3.8-2.el8_2.1`
`dovecot` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-debugsource` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-devel` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-mysql-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pgsql-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`
`dovecot-pigeonhole-debuginfo` Red Hat:enterprise_linux:8::crb	All versions	`1:2.3.8-2.el8_2.1`

Products include Dovecot Dovecot.

How do I fix CVE-2020-10957?

Upgrade to a fixed version.

Is CVE-2020-10957 being exploited?

There is no known exploitation of CVE-2020-10957 in the wild and no public exploit code.

All Dovecot Dovecot vulnerabilities

Sources

Also known as ALPINE-CVE-2020-10957, DEBIAN-CVE-2020-10957, GHSA-q55g-848v-f654, RHSA-2020:2901, UBUNTU-CVE-2020-10957.