What is CVE-2018-20552?

CVE-2018-20552 is a high-severity vulnerability in Broadcom Tcpreplay, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2018-12-28.

How severe is CVE-2018-20552?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2018-20552 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Broadcom Tcpreplay

CVE-2018-20552

Tcpreplay before 4.3.1 has a heap-based buffer over-read in packet2tree in tree.c.

Vulnerability class: Buffer Overflow

Published 2018-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Broadcom Tcpreplay

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

Marsman1996/pocs

References

github.com/appneta/tcpreplay/issues/530 (Exploit, Third Party Advisory)
github.com/appneta/tcpreplay/pull/532/commits/6b830a1640ca20528032c89a4fdd8291a… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20552?: CVE-2018-20552 is a high-severity vulnerability in Broadcom Tcpreplay, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2018-12-28.
How severe is CVE-2018-20552?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2018-20552 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.