CVE-2025-9157Public exploit

Local crash via stale reallocated packet pointer

Published Aug 19, 2025 · Updated Aug 19, 2025

Use-after-free in Tcpreplay tcprewrite 4.5.2-beta1 through 4.5.2-beta2 allows local users to crash the utility via a crafted pcap. With --fixlen padding enabled, untrunc_packet reallocates the packet buffer but leaves callers using the freed pointer during IPv4 checksum recalculation. A local user must cause tcprewrite to process the malformed capture; the demonstrated consequence is a SIGABRT process crash.

CVSS severity5.3
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Tcpreplay tcprewrite 4.5.2-beta1 through 4.5.2-beta2 allows local users to crash the utility via a crafted pcap. With --fixlen padding enabled, untrunc_packet reallocates the packet buffer but leaves callers using the freed pointer during IPv4 checksum recalculation. A local user must cause tcprewrite to process the malformed capture; the demonstrated consequence is a SIGABRT process crash.

The record

CVE
CVE-2025-9157
Published
Aug 19, 2025
Updated
Aug 19, 2025
Vendor
AppNeta
Product
Tcpreplay
Classifications
CWE-416, CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.5.2-beta1
  2. Affected versionversion=4.5.2-beta2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

AppNeta · Tcpreplayversion=4.5.2-beta1; version=4.5.2-beta2

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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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