CVE-2006-2630: Symantec Antivirus and Client Security stack buffer overflow

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 18 September 2026. Confidence: medium.

critical priorityCVSS 10.0 with network reachability, no authentication and full confidentiality, integrity and availability impact, combined with a very high EPSS score, makes this an urgent patching priority despite the thin technical detail.

What it is

Symantec Antivirus 10.1 and Client Security 3.1 contain a stack-based buffer overflow that remote attackers can trigger through unspecified attack vectors. The record does not identify the vulnerable component or the exact input that overflows the buffer, so defenders cannot scope exposure from the description alone. Because the flaw is remotely reachable and can lead to code execution, it is a serious pre-authentication risk for any host running the affected builds.

Impact

A successful exploit allows remote code execution in the context of the affected Symantec service or process. That can give an attacker full control of the host, including the ability to disable protection or pivot further into the network.

Attack surface

The CVSS vector AV:N/AC:L/Au:N/C:C/I:C/A:C indicates the flaw is reachable over the network with no authentication and no user interaction. The description does not specify which protocol, port or file format carries the malicious input.

Exploitation

The record is not listed in CISA KEV and no ransomware use is documented, but EPSS is very high at 0.73558 (99.4th percentile), indicating a strong likelihood of attempted exploitation. Reference tags show only patch and vendor advisory material, with no public exploit tag.

What to do

• Apply the vendor patches referenced in the Symantec security response and Secunia advisories for Antivirus 10.1 and Client Security 3.1.
• If patching cannot be done immediately, restrict network access to the affected Symantec services to trusted management hosts only.
• Retire or isolate end-of-life Symantec Antivirus 10.1 and Client Security 3.1 installations that no longer receive vendor support.
• Monitor vendor advisories for updated guidance, since the record does not name the vulnerable component or attack vector.

Detection

• Watch for unexpected crashes or restarts of Symantec antivirus and client security processes on endpoints.
• Alert on suspicious child processes spawned by Symantec services, which would indicate successful code execution.
• Review network traffic to Symantec management or update ports for anomalous payloads from untrusted sources.
• Correlate endpoint telemetry for memory corruption indicators in Symantec processes with inbound network connections.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.