CVE-2025-9998

Service interruption via unchecked packet sequencing

Published Sep 5, 2025 · Updated Feb 26, 2026

Improper packet-sequence validation in PcVue Networking allows attackers to stop affected server applications with crafted messages. The TCP client/server Networking server fails to check packet ordering before processing a message sequence, so malformed sequencing stops the process. Exploitation requires local-network access plus knowledge of payload structures, IP addresses, and the specific Networking configuration; the consequence is a server-process outage.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper packet-sequence validation in PcVue Networking allows attackers to stop affected server applications with crafted messages. The TCP client/server Networking server fails to check packet ordering before processing a message sequence, so malformed sequencing stops the process. Exploitation requires local-network access plus knowledge of payload structures, IP addresses, and the specific Networking configuration; the consequence is a server-process outage.

The record

CVE
CVE-2025-9998
Published
Sep 5, 2025
Updated
Feb 26, 2026
Vendor
ARC Informatique
Product
PcVue
Classifications
CWE-754, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=12.0.0 <=12.0.31
  2. Affected versionversion=15.0.0 <=15.2.12
  3. Affected versionversion=16.0.0 <=16.3.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ARC Informatique · PcVueversion=12.0.0 <=12.0.31; version=15.0.0 <=15.2.12; version=16.0.0 <=16.3.3

Published CVSS scores

6.0ARC InformatiqueCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:A/AU:Y/R:U/RE:M/U:Green

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

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo