Buffer overflow in Isync Project
CVE-2021-44143
A flaw was found in mbsync in isync 1.4.0 through 1.4.3. Due to an unchecked condition, a malicious or compromised IMAP server could use a crafted mail message that lacks headers (i.e., one that starts with an empty line) to provoke a heap overflow, which could conceivably be exploited for remote code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.038 (89.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.038 · change: +0.001
Affected products
- Isync Project
- Debian Linux — versions 9.0, 10.0, 11.0
- Fedoraproject Fedora — versions 34, 35
Weakness classification (CWE)
References
- bugs.debian.org/cgi-bin/bugreport.cgi (Third Party Advisory)
- sourceforge.net/p/isync/isync/ref/master/tags/ (Third Party Advisory)
- sourceforge.net/p/isync/isync/commit_browser (Patch, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/12/03/2 (mailing-list, Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202208-15 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-44143?
- CVE-2021-44143 is a critical-severity vulnerability in Isync Project, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-11-22.
- How severe is CVE-2021-44143?
- Critical severity. CVSS v3 base score is 9.8 out of 10.