Buffer overflow in Wireshark
CVE-2021-39926
Buffer overflow in the Bluetooth HCI_ISO dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.078 (94.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.076 · newest: 0.078 · change: +0.002
Affected products
- Wireshark
- Wireshark Foundation — versions >=3.4.0, <3.4.10
- Debian Linux — versions 10.0, 11.0
- Fedoraproject Fedora — versions 34, 35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wireshark.org/security/wnpa-sec-2021-08.html (Vendor Advisory)
- gitlab.com/wireshark/wireshark/-/issues/17649 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39926.json (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2021/dsa-5019 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202210-04 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39926?
- CVE-2021-39926 is a high-severity vulnerability in Wireshark, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-19.
- How severe is CVE-2021-39926?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-39926 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.