Improper validation of packets sequencing

Description

The sequence of packets received by a Networking server are not correctly checked. An attacker could exploit this vulnerability to send specially crafted messages to force the application to stop.

Scores

EPSS (exploitation in 30 days)

0.27% · top 81% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.0.

Weakness

• CWE-754 Improper Check for Unusual or Exceptional Conditions (opens in a new tab)All about CWE-754 and its CVEs

Affected products

• arcinfo · PcVue

  • affected 16.0.0 – ≤ 16.3.3
  • affected 15.0.0 – ≤ 15.2.12
  • affected 12.0.0 – ≤ 12.0.31

What to do

Solution: Harden the configuration Who should apply this recommendation: All users To reduce the risk of exploitation, ARC Informatique strongly recommends implementing the following defensive measures: * Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from unsecure networks. * Locate control system networks and remote devices behind firewalls and isolate them from business networks. * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices. Update PcVue Who should apply this recommendation: All users running affected components. Apply the patch by installing a fixed PcVue version. A fixed release must be installed on all stations for the fix to be fully applied. Existing projects require a settings update for the fix to be applied. The complete update procedure and verification steps are described in the Knowledge Base article KB1254 ( https://www.pcvue.com/?post_type=post&s=&kbase_id=kb1254 ) . For new projects, the settings are configured by default with secured values. To verify that the patch has been applied correctly, the user must check that: * The File version property of the file ./bin/sv32.exe matches the deployed release or later, and ensure that any earlier release is no longer used; * The Interoperability issues settings of the Networking feature are disabled. Available patches: Patch provided in: * PcVue 16.3.4 (16.3.4902.3112) * PcVue 15.2.13 (15.2.13902.37126) * PcVue 12.0.32 (12.0.32900.37130)

Exploitation: No POC available.

Exploitation: Not known to be exploited

References (1)

• https://www.pcvue.com/security/#SB2025-4 (opens in a new tab)vendor-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-9998](https://trackcve.app/badge/CVE-2025-9998.svg)](https://trackcve.app/cve/CVE-2025-9998)

Record last updated 26 Feb 2026, 07:54 UTC.