PT-2021-22767 · Wireshark+2 · Wireshark+2

Published 2021-11-19 · Updated 2022-03-29 · CVE-2021-39923

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Wireshark versions 3.2.0 through 3.2.17 Wireshark versions 3.4.0 through 3.4.9

Description The issue is related to a large loop in the PNRP dissector and a NULL pointer exception in the IPPUSB dissector, allowing denial of service via packet injection or crafted capture file.

Recommendations For Wireshark versions 3.2.0 through 3.2.17, update to a version outside of this range to resolve the issue. For Wireshark versions 3.4.0 through 3.4.9, update to a version outside of this range to resolve the issue. As a temporary workaround, consider disabling the PNRP and IPPUSB dissectors until a patch is available.

Exploit

Fix

DoS

Weakness Enumeration

CWE-834

Related Identifiers

ALT-PU-2021-3354

ALT-PU-2022-1096

ALT-PU-2022-1368

ALT-PU-2022-1599

AZL-7411

CVE-2021-39923

DLA-2849-1

DSA-5019-1

Affected Products

Alt Linux

Astra Linux

Wireshark

References · 19

• 🔥 https://gitlab.com/wireshark/wireshark/-/issues/17705 · Exploit
• https://cve.org/CVERecord?id=CVE-2021-39923 · Security Note
• https://ubuntu.com/security/CVE-2021-39923 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-39923 · Vendor Advisory
• https://wireshark.org/security/wnpa-sec-2021-11.html · Vendor Advisory
• https://osv.dev/vulnerability/AZL-7411 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39923 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-39923 · Vendor Advisory
• https://gitlab.com/wireshark/wireshark/-/issues/17684 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2849-1 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5019-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-39923 · Vendor Advisory
• https://debian.org/security/2021/dsa-5019 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-39923 · Vendor Advisory
• https://t.me/cvenotify/23723 · Telegram Post