CVE-2025-9385Public exploit

Process crash via stale IPv6 packet pointer

Published Aug 24, 2025 · Updated Aug 25, 2025

Heap use-after-free in AppNeta Tcpreplay 4.5.0 through 4.5.1 allows local users to crash tcprewrite via a crafted IPv6 pcap file. The fix_ipv6_checksums function reads an obsolete packet pointer after untrunc_packet reallocates the packet buffer and frees its original storage. Reaching the flaw requires local execution of tcprewrite with IPv6 checksum recalculation and malformed MPLS-encapsulated packet data; the demonstrated consequence is process termination.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap use-after-free in AppNeta Tcpreplay 4.5.0 through 4.5.1 allows local users to crash tcprewrite via a crafted IPv6 pcap file. The fix_ipv6_checksums function reads an obsolete packet pointer after untrunc_packet reallocates the packet buffer and frees its original storage. Reaching the flaw requires local execution of tcprewrite with IPv6 checksum recalculation and malformed MPLS-encapsulated packet data; the demonstrated consequence is process termination.

The record

CVE
CVE-2025-9385
Published
Aug 24, 2025
Updated
Aug 25, 2025
Vendor
AppNeta
Product
Tcpreplay
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=4.5.0
  2. Affected versionversion=4.5.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

AppNeta · Tcpreplayversion=4.5.0; version=4.5.1

Published CVSS scores

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
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 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
T1499Endpoint Denial of Service

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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