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🛡️ CVE-2023-27786 — tcpreplay

🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-476 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An issue found in TCPprep v.4.4.3 allows a remote attacker to cause a denial of service via the macinstring function.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-27786 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2023-27786 is recorded against 1 package.

  • tcpreplay

Timeline and source

Published on 16 March 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org

Other advisories for this package

tcpreplay has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-476: NULL Pointer Dereference) in other software:

CVE-2023-27786 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ⚠️ Yes
Source NVD
Published 2023-03-16
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
tcpreplay — —

References

Exploit, Issue Tracking, Patch https://github.com/appneta/tcpreplay/issues/782
Exploit, Issue Tracking, Patch https://github.com/appneta/tcpreplay/issues/782

Similar Threats

Exploit Protection

Are you running tcpreplay?

CVE-2023-27786 carries CVSS 7.5 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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