What is CVE-2020-12740?

CVE-2020-12740 is a critical-severity vulnerability in Broadcom Tcpreplay, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2020-05-08.

How severe is CVE-2020-12740?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Broadcom Tcpreplay

CVE-2020-12740

tcprewrite in Tcpreplay through 4.3.2 has a heap-based buffer over-read during a get_c operation. The issue is being triggered in the function get_ipv6_next() at common/get.c.

Vulnerability class: Buffer Overflow

Published 2020-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.000

Affected products

Broadcom Tcpreplay
Fedoraproject Fedora — versions 31, 32

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/appneta/tcpreplay/issues/576 (Exploit, Third Party Advisory, Issue Tracking)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2020-12740?: CVE-2020-12740 is a critical-severity vulnerability in Broadcom Tcpreplay, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2020-05-08.
How severe is CVE-2020-12740?: Critical severity. CVSS v3 base score is 9.1 out of 10.