7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.037 Low
EPSS
Percentile
91.7%
Dovecot 2.3.11.3 Denial Of Service Vulnerability
Vendor: OX Software GmbH
Internal reference: DOV-4113 (Bug ID)
Vulnerability type: CWE-20: Improper Input Validation
Vulnerable version: 2.3.11-2.3.11.3
Vulnerable component: lda, lmtp, imap
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 2.3.13
Vendor notification: 2020-09-10
Solution date: 2020-09-14
Public disclosure: 2021-01-04
CVE reference: CVE-2020-25275
CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Researcher credit: Innokentii Sennovskiy (Rumata888) from BI.ZONE
Vulnerability Details:
Mail delivery / parsing crashed when the 10 000th MIME part was
message/rfc822 (or if parent was multipart/digest). This happened
due to earlier MIME parsing changes for CVE-2020-12100.
Risk:
Malicious sender can crash dovecot repeatedly by sending / uploading
message with more than 10 000 MIME parts.
Workaround:
These are usually dropped by MTA, where the mitigation can also be applied.
Solution:
Operators should update to 2.3.13 or later version.
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.037 Low
EPSS
Percentile
91.7%