CVE-2025-9019Public exploitNetwork attack vector

Utility crash via malformed IPv6 include rule

Published Aug 15, 2025 · Updated Aug 15, 2025

Out-of-bounds read in AppNeta Tcpreplay tcpprep 4.5.1 allows context-dependent attackers to crash the utility via a malformed options file. The include-option path passes a two-byte string through parse_xX_str and parse_cidr to mask_cidr6, which reads one byte beyond the heap allocation. An operator must load the supplied file, and the demonstrated consequence is termination of the tcpprep process.

CVSS severity5.9
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in AppNeta Tcpreplay tcpprep 4.5.1 allows context-dependent attackers to crash the utility via a malformed options file. The include-option path passes a two-byte string through parse_xX_str and parse_cidr to mask_cidr6, which reads one byte beyond the heap allocation. An operator must load the supplied file, and the demonstrated consequence is termination of the tcpprep process.

The record

CVE
CVE-2025-9019
Published
Aug 15, 2025
Updated
Aug 15, 2025
Vendor
AppNeta
Product
Tcpreplay
Classifications
CWE-122, CWE-787, CWE-119, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AppNeta · Tcpreplayversion=4.5.1

Published CVSS scores

1.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.1VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
2.6VulDBAV:N/AC:H/Au:N/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1204.002User Execution: Malicious File

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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