CVE-2021-3657
Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.46% probability · 88th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- isync project/isync · fedoraproject/fedora · redhat/enterprise linux · debian/debian linux
- Source
- patrick@puiterwijk.org
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2028932Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/12/03/1Mailing List, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2028932Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/12/03/1Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.