Skip to content
Fencer Intel
medium 5.5

CVE-2018-18409 json

A stack-based buffer over-read exists in setbit() at iptree.h of TCPFLOW 1.5.0, due to received incorrect values causing incorrect computat…

published 2018-10-17 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10138

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

A stack-based buffer over-read exists in setbit() at iptree.h of TCPFLOW 1.5.0, due to received incorrect values causing incorrect computation, leading to denial of service during an address_histogram call or a get_histogram call.

Patch / fix

  • tcpflow Debian 14, Debian 13, Debian 12 1.5.2+repack1-1

debian advisories DEBIAN-CVE-2018-18409

  • tcpflow Ubuntu 16.04 LTS 1.4.5+repack1-1ubuntu0.1
  • tcpflow Ubuntu 18.04 LTS 1.4.5+repack1-4ubuntu0.18.04.1
  • tcpflow Ubuntu Pro 14.04 LTS 1.4.4+repack1-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-18409

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tcpflow Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 1.5.0-r1

alpine advisories ALPINE-CVE-2018-18409

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2018-18409 updated cvss 5.5

tcpflow: stack-based buffer over-read exists in setbit() at iptree.h

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

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

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/simsong/tcpflow/issues/195 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/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

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.