01 Record

CVE-2021-20247

A flaw was found in mbsync before v1.3.5 and v1.4.1. Validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted

UnratedPUBLISHEDCNA: redhat

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

A flaw was found in mbsync before v1.3.5 and v1.4.1. Validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.88% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 77.6% of scored records. A rank, not a probability.
NVD base score: 7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-02-23 18:45Z5 YR AGO

Last updated

2024-08-03 17:37Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-20Improper Input ValidationClass
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base

Data version

5.1

Document digest

038e21d6e2abbed4c1dd58a6086c264b021a2cbc7c6ee978c15dd95ca9843e9f

05 Affected products

VendorProductVersionsPlatforms

n/aisync/mbsyncbefore 1.35, before 1.4.1—

06 References

bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1928963x_refsource_MISC
www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/02/22/1x_refsource_MISC
lists.fedoraproject.orgFEDORA-2021-954ebabcf7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2021-ef8c2acfcehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/vendor-advisoryx_refsource_FEDORA
lists.debian.org[debian-lts-announce] 20220701 [SECURITY] [DLA 3066-1] isync security updatehttps://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlmailing-listx_refsource_MLIST
security.gentoo.orgGLSA-202208-15https://security.gentoo.org/glsa/202208-15vendor-advisoryx_refsource_GENTOO

01 Record index

CVE-2021-20247

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-20247

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References