CVE-2023-43279Public exploitNetwork attack vector

Application crash via empty pseudo-NAT argument

Published Mar 12, 2024 · Updated Nov 4, 2025

Null pointer dereference in Tcpreplay 4.4.4 allows attackers to crash tcprewrite via an empty pseudo-NAT argument. parse_cidr passes the null CIDR pointer produced by an empty --pnat value to mask_cidr6, which dereferences it before validation. The crash requires an affected user or automation to invoke tcprewrite with that option, and the consequence is limited to the running process.

CVSS severity6.5
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Tcpreplay 4.4.4 allows attackers to crash tcprewrite via an empty pseudo-NAT argument. parse_cidr passes the null CIDR pointer produced by an empty --pnat value to mask_cidr6, which dereferences it before validation. The crash requires an affected user or automation to invoke tcprewrite with that option, and the consequence is limited to the running process.

The record

CVE
CVE-2023-43279
Published
Mar 12, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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