CVE-2018-6836

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a...

9.8 CriticalFix available

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.72%Up 1.1 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2018-6836
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-763
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-6836
Updated: 2026-11-02

EUVDEUVD-2018-18582 No score

Record: EUVD-2018-18582
Updated: 2026-11-03

GitHub AdvisoriesGHSA-79gq-68m6-v3vg 9.8

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a...

Record: GHSA-79gq-68m6-v3vg
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-763
Updated: 2026-11-02

OSV 9.8

Record: CVE-2018-6836
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2018-6836 9.8

Record: UBUNTU-CVE-2018-6836
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

wireshark

Affected packages

Affected packages
Package	Affected	Fixed
`wireshark` Ubuntu:14.04:LTS	before 2.6.3-1~ubuntu14.04.1, plus listed versions 1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-11.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.1	2.6.3-1~ubuntu14.04.1
`wireshark` Ubuntu:16.04:LTS	before 2.6.3-1~ubuntu16.04.1, plus listed versions 1.12.7+g7fc8978-11.12.8+g5b6e543-22.0.1+g59ea380-3build12.0.2+ga16e22e-12.2.6+g32dac6a-2ubuntu0.16.04	2.6.3-1~ubuntu16.04.1
`wireshark` Ubuntu:18.04:LTS	before 2.6.3-1~ubuntu18.04.1, plus listed versions 2.4.2-12.4.3-12.4.4-12.4.5-1	2.6.3-1~ubuntu18.04.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-6836 is a critical vulnerability (CVSS 9.8) in Wireshark, published February 8, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.72%, the 86th percentile. Fixed in wireshark 2.6.3-1~ubuntu14.04.1.