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Fencer Intel
medium 5.5

CVE-2021-41043 json

Use after free in tcpslice triggers AddressSanitizer, no other confirmed impact.

published 4y ago modified 4mo ago also EUVD-2021-28194

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Use after free in tcpslice triggers AddressSanitizer, no other confirmed impact.

Patch / fix

  • The Tcpdump Group tcpslice 1.5
  • tcpslice Debian 14, Debian 13, Debian 12 1.5-1

debian advisories DEBIAN-CVE-2021-41043

  • tcpdump RHEL 9 14:4.99.0-9.el9
  • tcpdump RHEL 8 14:4.9.3-3.el8_9.1
  • tcpdump RHEL 9.2 EUS 14:4.99.0-6.el9_2.1
  • tcpdump RHEL 8.8 EUS 14:4.9.3-3.el8_8.1
  • tcpdump RHEL 8.6 EUS 14:4.9.3-3.el8_6.1

red hat advisories RHSA-2024:2211RHSA-2024:1090RHSA-2024:0769RHSA-2024:0571RHSA-2024:0410

  • tcpdump AlmaLinux 9 14:4.99.0-9.el9
  • tcpdump AlmaLinux 8 14:4.9.3-3.el8_9.1.alma.1

almalinux advisories ALSA-2024:2211ALSA-2024:0769

  • tcpdump Rocky Linux 9 4:4.99.0-9.el9
  • tcpdump Rocky Linux 8 4:4.9.3-3.el8_9.1

rocky linux advisories RLSA-2024:2211RLSA-2024:0769

Is CVE-2021-41043 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41043 updated cvss 5.5

tcpslice: use-after-free in extract_slice()

  • Red Hat Enterprise Linux 6 tcpdump Red Hat Enterprise Linux 7 tcpdump
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) tcpdump 4.9.3-3.el8_9.1
    fixed: vendor fix RHSA-2024:0769
  • Red Hat Enterprise Linux AppStream (v. 9) tcpdump 4.99.0-9.el9
    fixed: vendor fix RHSA-2024:2211
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) tcpdump 4.9.3-3.el8_6.1
    fixed: vendor fix RHSA-2024:0410
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) tcpdump 4.9.3-3.el8_8.1
    fixed: vendor fix RHSA-2024:0571
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) tcpdump 4.99.0-6.el9_2.1
    fixed: vendor fix RHSA-2024:1090

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/the-tcpdump-group/tcpslice/issues/11 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • The Tcpdump Group tcpslice

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.