CVE-2020-7957 : The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet g

The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.

Published 2020-02-12 17:15:13

Updated 2022-01-01 19:51:50

Source MITRE

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2020-7957

Dovecot » Dovecot
Versions from including (>=) 2.3.9 and before (<) 2.3.9.3
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 31
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 30
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-7957

EPSS FAQ

0.66%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 69 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-7957

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
3.1	LOW	CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L	1.6	1.4	MITRE
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: None Availability: Low
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	3.9	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: Low

CWE ids for CVE-2020-7957

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-7957

https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html

[Dovecot-news] CVE-2020-7957: Specially crafted mail can crash snippet generation
Exploit;Mailing List;Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/

[SECURITY] Fedora 31 Update: dovecot-2.3.9.3-1.fc31 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
http://www.openwall.com/lists/oss-security/2020/02/12/2

oss-security - CVE-2020-7957: Dovecot: Specially crafted mail can crash snippet generation
Exploit;Mailing List;Third Party Advisory
https://dovecot.org/security

Security
Vendor Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/

[SECURITY] Fedora 30 Update: dovecot-2.3.9.3-1.fc30 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

Jump to

Vulnerability Details : CVE-2020-7957

Products affected by CVE-2020-7957

Exploit prediction scoring system (EPSS) score for CVE-2020-7957

CVSS scores for CVE-2020-7957

CWE ids for CVE-2020-7957

References for CVE-2020-7957