wireshark: free operation on an uninitialized memory address in wiretap/netmon.c
Published Feb 8, 2018
9.8
CRITICALCVSS 3.0
EPSS 2.72%
Description
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
wireshark
Will not fix
Red Hat Enterprise Linux 6
wireshark
Will not fix
Red Hat Enterprise Linux 7
wireshark
Will not fix
Red Hat Enterprise Linux 8
wireshark
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | wireshark | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | wireshark | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | wireshark | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | wireshark | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.72% (0.02721) | 85.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.82% (0.02817) | 84.66th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.39% (0.00391) | 58.05th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.79% (0.00787) | 81.66th | v3 (v2023.03.01) |
| Apr 4, 2024 | 0.79% (0.00787) | 81.11th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.79% (0.00787) | 79.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.65% (0.00649) | 76.16th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.62% (0.01623) | 33.90th | v1 |
| Jan 6, 2022 | 1.62% (0.01623) | 33.20th | v1 |
| Sep 1, 2021 | 1.62% (0.01623) | 73.32th | v1 |
| Apr 14, 2021 | 1.62% (0.01623) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2018-6836 Vendor Advisory
- https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14397 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1543582 Issue Tracking
- https://code.wireshark.org/review/#/c/25660/ x_refsource_MISCIssue TrackingPatch
- https://code.wireshark.org/review/#/c/25660/2/wiretap/netmon.c x_refsource_MISCPatch
- https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=28960d79cca262ac6b974f339697b299a1e28fef x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2018-6836
- https://www.cve.org/CVERecord?id=CVE-2018-6836
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-6836 | Vendor Advisory | |
| https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14397 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1543582 | Issue Tracking | |
| https://code.wireshark.org/review/#/c/25660/ | x_refsource_MISCIssue TrackingPatch | |
| https://code.wireshark.org/review/#/c/25660/2/wiretap/netmon.c | x_refsource_MISCPatch | |
| https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=28960d79cca262ac6b974f339697b299a1e28fef | x_refsource_MISC | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-6836 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-6836 |
Change history (0)
No recorded changes yet.