HIGH
CVE-2021-39923
CWE-834Published: November 19, 2021· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
Large loop in the PNRP 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
Technical Analysis
CVE-2021-39923 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39923.jsonThird Party Advisory
→
https://gitlab.com/wireshark/wireshark/-/issues/17684Issue Tracking · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/12/msg00015.htmlMailing List · Third Party Advisory
→
https://www.debian.org/security/2021/dsa-5019Third Party Advisory
→
https://www.wireshark.org/security/wnpa-sec-2021-11.htmlVendor Advisory
→
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39923.jsonThird Party Advisory
→
https://gitlab.com/wireshark/wireshark/-/issues/17684Issue Tracking · Patch · Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2021/12/msg00015.htmlMailing List · Third Party Advisory
→
https://www.debian.org/security/2021/dsa-5019Third Party Advisory
→
https://www.wireshark.org/security/wnpa-sec-2021-11.htmlVendor Advisory
Quick Facts
CVE IDCVE-2021-39923
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-834
CISA KEVNo
Affected2 vendor(s)
PublishedNov 19, 2021
Related CVEs (CWE-834)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-39923 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.