CVE-2021-39926
HIGHCVSS 7.5/10EPSS 7.50%
Last modified
CVE-2021-39926 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 7.50% chance of exploitation in the next 30 days.
Description
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
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Wireshark | Wireshark | >= 3.4.0, <= 3.4.9 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Fedora | 35 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39926.jsonThird Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/17649Exploit, Issue Tracking, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202210-04Third Party Advisory
- https://www.debian.org/security/2021/dsa-5019Third Party Advisory
- https://www.wireshark.org/security/wnpa-sec-2021-08.htmlVendor Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39926.jsonThird Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/17649Exploit, Issue Tracking, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202210-04Third Party Advisory
- https://www.debian.org/security/2021/dsa-5019Third Party Advisory
- https://www.wireshark.org/security/wnpa-sec-2021-08.htmlVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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
How severe is CVE-2021-39926?
CVE-2021-39926 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 7.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39926?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-39920NULL pointer exception in the IPPUSB dissector in Wireshark …7.5
- CVE-2021-39921NULL pointer exception in the Modbus dissector in Wireshark …7.5
- CVE-2021-39922Buffer overflow in the C12.22 dissector in Wireshark 3.4.0 t…7.5
- CVE-2021-39923Large loop in the PNRP dissector in Wireshark 3.4.0 to 3.4.9…7.5
- CVE-2021-39924Large loop in the Bluetooth DHT dissector in Wireshark 3.4.0…7.5
- CVE-2021-39925Buffer overflow in the Bluetooth SDP dissector in Wireshark …7.5
- CVE-2021-39927Server side request forgery protections in GitLab CE/EE vers…4.3
- CVE-2021-39928NULL pointer exception in the IEEE 802.11 dissector in Wires…7.5
- CVE-2021-39929Uncontrolled Recursion in the Bluetooth DHT dissector in Wir…7.5
- CVE-2021-3993showdoc is vulnerable to Cross-Site Request Forgery (CSRF)6.5
- CVE-2021-39930Missing authorization in GitLab EE versions between 12.4 and…4.3
- CVE-2021-39931An issue has been discovered in GitLab CE/EE affecting all v…4.3
Are you affected by CVE-2021-39926?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST