PT-2021-5009 · Wireshark+3 · Wireshark+3

Published 2021-11-17 · Updated 2024-06-15 · CVE-2021-39921

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

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 NULL pointer exception in the Modbus dissector, which can be exploited to cause a denial of service via packet injection or crafted capture file. This can allow a remote attacker to disrupt service.

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 Modbus dissector until a patch is available.

Exploit

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2021-3354

ALT-PU-2022-1096

ALT-PU-2022-1368

ALT-PU-2022-1599

AZL-7409

BDU:2021-05776

CVE-2021-39921

DLA-2849-1

DSA-5019-1

MGASA-2021-0518

OPENSUSE-SU-2021:1566-1

OPENSUSE-SU-2021:3938-1

OPENSUSE-SU-2021_1566-1

OPENSUSE-SU-2021_3938-1

OPENSUSE-SU-2024:11641-1

SUSE-SU-2021:3938-1

Affected Products

Alt Linux

Astra Linux

Suse

Wireshark

References · 56

• 🔥 https://gitlab.com/wireshark/wireshark/-/issues/17703 · Exploit
• https://osv.dev/vulnerability/AZL-7409 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-39921 · Security Note
• https://wireshark.org/security/wnpa-sec-2021-14.html · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5019-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ · Vendor Advisory
• https://debian.org/security/2021/dsa-5019 · Vendor Advisory
• https://security.gentoo.org/glsa/202210-04 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05776 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-39921 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:3938-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:3938-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11641-1 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2021-0518.html · Security Note