How severe is CVE-2020-12740?

CVE-2020-12740 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2020-12740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12740?

CVE-2020-12740 primarily affects Broadcom Tcpreplay. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-12740?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-12740 published?

CVE-2020-12740 was published on 2020-05-08 and last updated on 2026-06-17.

CVE-2020-12740

CVE-2020-12740 is a critical-severity vulnerability in Broadcom Tcpreplay with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Broadcom Tcpreplay
Published: 2020-05-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-12740?: CVE-2020-12740 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2020-12740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12740?: CVE-2020-12740 primarily affects Broadcom Tcpreplay. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-12740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12740 published?: CVE-2020-12740 was published on 2020-05-08 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:broadcom:tcpreplay:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

More vulnerabilities in Broadcom Tcpreplay

CVE-2018-18408 — Critical (CVSS 9.8): A use-after-free was discovered in the tcpbridge binary of Tcpreplay 4.3.0 beta1. The issue gets triggered in the…
CVE-2025-51006 — High (CVSS 7.8): Within tcpreplay's tcprewrite, a double free vulnerability has been identified in the dlt_linuxsll2_cleanup() function…
CVE-2022-37049 — High (CVSS 7.8): The component tcpprep in Tcpreplay v4.4.1 was discovered to contain a heap-based buffer overflow in parse_mpls at…
CVE-2022-37048 — High (CVSS 7.8): The component tcprewrite in Tcpreplay v4.4.1 was discovered to contain a heap-based buffer overflow in…
CVE-2022-37047 — High (CVSS 7.8): The component tcprewrite in Tcpreplay v4.4.1 was discovered to contain a heap-based buffer overflow in get_ipv6_next at…
CVE-2022-27418 — High (CVSS 7.8): Tcpreplay v4.4.1 has a heap-based buffer overflow in do_checksum_math at /tcpedit/checksum.c.

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