7.5

CVE-2021-39921: debian debian_linux NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-39921DEBIAN-CVE-2021-39921
Published 19-11-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-39921 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 3.37% chance of exploitation in the next 30 days, higher than 88.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
3.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 7 · Related 4
DLA-2849-1DSA-5019-1MGASA-2021-0518OPENSUSE-SU-2021:1566-1OPENSUSE-SU-2021:3938-1OPENSUSE-SU-2024:11641-1

Timeline

  1. 19-11-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

NULL pointer exception in the Modbus 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 versions

EPSS trend

Probability

3.37%

Chance of exploitation in the next 30 days

Percentile

89%

Versus all other CVEs

30-day change

0.00 pp

From 3.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
3.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (gitlab.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Debian2 products
Fedoraproject1 product
Ubuntu1 product
  • wiresharkAll versions (No fix recorded)
Wireshark1 product
  • wireshark≥ 3.2.0, ≤ 3.2.17 | ≥ 3.4.0, ≤ 3.4.9
Wireshark foundation1 product
  • wireshark≥ 3.4.0, < 3.4.10 | ≥ 3.2.0, < 3.2.18

5 vendors · 6 products

References

12 links
Show all 12 references