NULL pointer dereference in Wireshark
CVE-2021-39921
NULL pointer exception in the Modbus dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file
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: 0.034 (88.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.034 · change: +0.001
Affected products
- Wireshark
- Wireshark Foundation — versions >=3.4.0, <3.4.10, >=3.2.0, <3.2.18
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 34, 35
Weakness classification (CWE)
References
- www.wireshark.org/security/wnpa-sec-2021-14.html (Vendor Advisory)
- gitlab.com/wireshark/wireshark/-/issues/17703 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39921.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)
- lists.debian.org/debian-lts-announce/2021/12/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202210-04 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39921?
- CVE-2021-39921 is a high-severity vulnerability in Wireshark, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-11-19.
- How severe is CVE-2021-39921?
- High severity. CVSS v3 base score is 7.5 out of 10.