Denial of Service Vulnerability in Wireshark PNRP Dissector
CVE-2021-39923

7.5HIGH

Key Information:

Vendor

Wireshark
Status
Wireshark
Vendor
CVE Published:
19 November 2021

What is CVE-2021-39923?

A vulnerability in the PNRP dissector of Wireshark versions 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 enables denial of service conditions. This issue arises from a large loop triggered by packet injection or a specially crafted capture file, potentially leading to application crashes and hindering normal operations during network analysis.

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Affected Version(s)

Wireshark >=3.2.0, <3.2.18 < 3.2.0, 3.2.18

Wireshark >=3.4.0, <3.4.10 < 3.4.0, 3.4.10

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE...
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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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