Vulnerability · Published Nov 19, 2021 · Assigned by GitLab
CVE-2021-39923
High 7.5
In plain English
A high-severity security flaw in Wireshark from Wireshark Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.6%top 24.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wireshark | 3.6.0-1 | DEBIAN-CVE-2021-39923 |
| Debian:13 | wireshark | 3.6.0-1 | DEBIAN-CVE-2021-39923 |
| Debian:14 | wireshark | 3.6.0-1 | DEBIAN-CVE-2021-39923 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wireshark Foundation | Wireshark | >=3.2.0, <3.2.18>=3.4.0, <3.4.10 |
References
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39923.json x_refsource_CONFIRM
- https://www.wireshark.org/security/wnpa-sec-2021-11.html x_refsource_MISC
- https://gitlab.com/wireshark/wireshark/-/issues/17684 x_refsource_MISC
- DSA-5019 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20211226 [SECURITY] [DLA 2849-1] wireshark security update mailing-list, x_refsource_MLIST