CVE-2020-18976
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the ...
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
CVE-2020-18976- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List No score
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
CVE-2020-18976- Updated
- 2026-11-02
EUVDEUVD-2020-10887 No score
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
EUVD-2020-10887- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v6p2-879w-fx47
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the ...
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
GHSA-v6p2-879w-fx47- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
OSV
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
CVE-2020-18976- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2020-18976
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
DEBIAN-CVE-2020-18976- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-18976
Buffer Overflow in Tcpreplay v4.3.2 allows attackers to cause a Denial of Service via the 'do_checksum' function in 'checksum.c'. It can be triggered by sending a crafted pcap file to the 'tcpreplay-edit' binary. This issue is different than CVE-2019-8381.
- Record
UBUNTU-CVE-2020-18976- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tcpreplayDebian:12 |
before 4.3.3-1 | 4.3.3-1 |
tcpreplayDebian:13 |
before 4.3.3-1 | 4.3.3-1 |
tcpreplayDebian:14 |
before 4.3.3-1 | 4.3.3-1 |
tcpreplayUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 3.4.4-23.4.4-2+deb8u1build0.16.04.13.4.4-2+deb8u1ubuntu0.1~esm13.4.4-2+deb8u1ubuntu0.1~esm23.4.4-2+deb8u1ubuntu0.1~esm3 |
None known |
tcpreplayUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 4.2.6-14.2.6-1ubuntu0.1~esm14.2.6-1ubuntu0.1~esm24.2.6-1ubuntu0.1~esm34.2.6-1ubuntu0.1~esm44.2.6-1ubuntu0.1~esm5 |
None known |
tcpreplayUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 4.3.2-1build14.3.2-1ubuntu0.1~esm14.3.2-1ubuntu0.1~esm24.3.2-1ubuntu0.1~esm3 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-18976 is a medium vulnerability (CVSS 5.5) in Broadcom Tcpreplay, published August 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile. Fixed in tcpreplay 4.3.3-1.