CVE-2021-39928: debian debian_linux NULL Pointer Dereference
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-39928DEBIAN-CVE-2021-39928
Published 18-11-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-39928 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 5.91% chance of exploitation in the next 30 days, higher than 93.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
5.91%
0%100%
Low · +0.23 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 7 · Related 4Timeline
- 18-11-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
5.91%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
+0.23 pp
From 5.68% on 19-09-2026
19-09-202619-10-2026
EPSS score5.91%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (gitlab.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- wireshark< 3.6.0-1
- debian_linuxEOL9.0
Fedoraproject1 product
- fedoraEOL34 | 35
Ubuntu1 product
- wiresharkAll versions (No fix recorded)
Wireshark1 product
- wireshark≥ 3.2.0, < 3.2.18 | ≥ 3.4.0, < 3.4.10
Wireshark foundation1 product
- wireshark≥ 3.4.0, < 3.4.10 | ≥ 3.2.0, < 3.2.18
5 vendors · 6 products
References
12 links- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
