SARA / Free Tools / CVE / CVE-2020-10957

CVE-2020-10957 — In Dovecot before 2

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.

CVSS

7.5 HIGH

EPSS

23.56% (top 4.10%)

CWE

—

Published

2020-05-18T13:56:25.000Z

Last modified

2024-08-04T11:21:13.823Z

CVSS vector

CVSS:3.0/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

Published: 2020-05-18T13:56:25.000Z
Last modified: 2024-08-04T11:21:13.823Z

09References

dovecot.org — https://dovecot.org/security
www.openwall.com — https://www.openwall.com/lists/oss-security/2020/05/18/1
www.openwall.com — http://www.openwall.com/lists/oss-security/2020/05/18/1
usn.ubuntu.com — https://usn.ubuntu.com/4361-1/
seclists.org — http://seclists.org/fulldisclosure/2020/May/37
packetstormsecurity.com — http://packetstormsecurity.com/files/157771/Open-Xchange-Dovecot-2.3.10-Null-Poi…
www.debian.org — https://www.debian.org/security/2020/dsa-4690
lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00059.html
lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…

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