Former CBS news anchor Dan Rather escalated a feud with his former employer yesterday, saying CBS Corp. Chief Executive Leslie Moonves “doesn’t know about news.

Mr. Moonves had said earlier Mr. Rather’s remarks that the network was “tarting” up its evening newscast with Katie Couric, Mr. Rather’s successor, were “sexist.”

The spat started Monday when Mr. Rather, speaking by phone on MSNBC’s “Morning Joe” program with Joe Scarborough, said CBS had made the mistake of taking the news broadcast and “dumbing it down, tarting it up,” and playing up topics such as celebrities over war coverage.

While referring to Ms. Couric as a “nice person,” Mr. Rather said “the mistake was to try to bring the ‘Today’ show ethos to the ‘Evening News,’ and to dumb it down, tart it up in hopes of attracting a younger audience.”

Ms. Couric was formerly a host on the “Today” morning show, which featured frequent celebrity guests and lighter segments.

Mr. Moonves, speaking at an event in New York yesterday morning sponsored by the S.I. Newhouse School of Public Communications at Syracuse University, called the remarks “sexist” and said he was surprised at the amount of negative coverage Ms. Couric was receiving.

“She’s been on the air for nine months,” Mr. Moonves said. “Let’s give her a break.

Ms. Couric started strong but has settled into a distant third in the evening news ratings race. Last month, her “CBS Evening News” set a record for its least-watched broadcast for at least two decades, then broke it the very next week.

Later yesterday, Mr. Rather said during an appearance on Fox News Channel’s “Your World with Neil Cavuto” program that he did not regret making his earlier remarks, but he insisted he was referring to CBS’s management of the newscast, not to Ms. Couric personally.

“It doesn’t have to do with Katie, it doesn’t have to do with gender,” Mr. Rather said. “Les Moonves knows about entertainment, but he doesn’t know about news.”

Mr. Rather left as “CBS Evening News” anchor in March 2005 and cut ties to the network a year later. He continued to be dogged by controversy surrounding his role in a story about President Bush’s Vietnam-era military service.

CBS’s corporate office referred questions about Mr. Rather’s latest remarks to Rick Kaplan, the executive producer of “CBS Evening News,” who said: “We are very much a hard-news program.

“I wish Dan was watching more closely,” Mr. Kaplan said, adding: “A lot of people here are very disappointed with him. … They went through some very dark days with Dan, and they don’t like hearing that they’re not doing the news. They damn well are.”

Mr. Moonves said earlier that he “absolutely” had confidence in Ms. Couric and the direction that “CBS Evening News” was taking, saying it was imperative to reach younger audiences. Evening news broadcasts could not continue to have audiences that are mainly over 60, Mr. Moonves said, otherwise “the evening news will die.”