Symantec has patched a widely reported flaw in the English versions of its corporate antivirus software.

The flaw, discovered by rival security vendor eEye Digital Security, affects recent versions of its Client Security and Antivirus Corporate Edition products. The vulnerability is considered serious, and could be exploited by hackers to run unauthorised software on unpatched PCs.

The patches are for English language versions of Symantec's products only, and a Symantec spokesman could not say when the complete line of products would be patched.

Symantec did not release many details on the flaw, but eEye has warned that it is the kind of vulnerability that could be used to build a self-replicating worm attack, similar to the Blaster and Slammer outbreaks of 2003.

That has not happened to date, and Symantec is "not aware of any customers impacted by this vulnerability, or of any exploits of this vulnerability," the alert said.

The problem affects version 3.0 and above of Client Security, and version 10 and above of Antivirus Corporate Edition. Symantec's Norton line of consumer anti-virus products are not affected.