Kim Zetter: The Reporting Behind Countdown to Zero Day

When a strange piece of malware surfaced in 2010 and turned out to be wrecking uranium centrifuges in Iran, most of the world had no idea what it was looking at. Kim Zetter was one of the few reporters who could explain it.

For more than two decades she's covered the hidden machinery of the digital age: voting machines nobody wanted to audit, a soldier who leaked to WikiLeaks, the supply-chain hack that slipped into the US government and the murky trade in zero-day exploits.

But Zetter never set out to be a cybersecurity reporter. Her first book was a guide to Jewish mysticism, and the weapon that made her name turned out to have a sibling that stayed hidden for another fifteen years.

Kim Zetter at a Glance

• Zetter lived and worked in Israel before she had a security beat, writing about Judaism and Israel for the Jerusalem Post, the Los Angeles Times and the San Francisco Chronicle. Her first book was Simple Kabbalah.
• By 2001 she was interviewing Bruce Schneier and Jeff Moss for PC World, and by 2003 she was reporting for Wired News.
• Her 2003–2004 series on electronic voting machines won a Maggie Award and made her one of the first reporters on the election security beat.
• In June 2010 she and Kevin Poulsen broke the news that an Army intelligence analyst, Bradley (now Chelsea) Manning, had been arrested for leaking to WikiLeaks.
• Zetter covered Stuxnet from its discovery, wrote the definitive 2011 Wired account of how it was deciphered and published Countdown to Zero Day in November 2014.
• After more than a decade at Wired she went independent, launching the Zero Day newsletter in March 2021 and writing the inside story of the SolarWinds hack for Wired in 2023.
• On July 22, 2025, she testified before a House Homeland Security subcommittee on Stuxnet's fifteenth anniversary.
• Through 2025 and 2026 her newsletter tracked a Trenchant executive who sold zero-days to a Russian broker, and in May 2026 she revealed Fast16, Stuxnet's hidden companion.

The Life of Kim Zetter

Zetter's Unlikely Beginnings

Kim Zetter's road to cybersecurity started nowhere near a computer. She spent years living and working in Israel, where she began studying Kabbalah among the Hassidic community, and her early bylines covered Judaism and Israel for the Jerusalem Post and for American papers like the Los Angeles Times and the San Francisco Chronicle.

That interest produced her first book, Simple Kabbalah, a plain-language guide to Jewish mysticism from Conari Press. She followed it with something even further from malware: a Lonely Planet guide to eating out in San Francisco, co-written with Andrew Dean Nystrom.

By then she'd settled in Berkeley, California, and found the beat that'd define her: the strange, fast-growing world of computer security.

From PC World to Wired News

Zetter's first security stories ran at PC World, where in 2001 she published a series of short interviews with people who'd go on to define the field. One was the cryptographer Bruce Schneier, then pushing vendors to disclose their bugs. Another was Jeff Moss, the 30-year-old founder of DEF CON and Black Hat.

By 2003 she'd moved to Wired News, which would be her home for more than a decade. One of her first pieces there was a small classic: a Seattle consultant bought a used BlackBerry on eBay for $15.50 and found it stuffed with a bank's corporate data.

She also became the reporter the puzzle-obsessed read. In 2005 she interviewed Jim Sanborn, the sculptor behind Kryptos, the encrypted artwork standing in the CIA's courtyard.

The Voting Machine Crusade

In late 2003, as counties across America rushed to buy touch-screen voting machines, Zetter started asking a simple question: how would anyone know if they counted wrong?

Her reporting on Diebold Election Systems found that the company had installed uncertified software on its machines in 17 California counties, and a former employee alleged the same had happened in Georgia before a 2002 upset, a claim Diebold denied. Her March 2004 feature "How E-Voting Threatens Democracy" pulled the threads together and won a Maggie Award from the Western Publications Association.

It took more than a decade for the rest of the country to catch up. When it did, in 2018, Zetter wrote two New York Times Magazine features, "The Myth of the Hacker-Proof Voting Machine" and "The Crisis of Election Security", that laid out for a general audience what she'd been documenting since the Bush years.

Breaking the Manning Story

On June 6, 2010, Zetter and her Wired colleague Kevin Poulsen published a scoop that rattled Washington. Federal officials had arrested a 22-year-old Army intelligence analyst, PFC Bradley Manning, who'd boasted online of giving WikiLeaks a classified video of a helicopter attack in Baghdad and some 260,000 diplomatic cables.

Manning, who later came out as Chelsea, had confided in former hacker Adrian Lamo over instant messenger, and Lamo turned the chat logs over to investigators and to Wired.

The story ran months before the cables themselves became public, and it was the first time most readers heard a name that'd dominate the news for years.

Deciphering Stuxnet

That same summer, a worm surfaced that'd consume the next several years of Zetter's life. Stuxnet was unlike anything researchers had seen: code built to reach the industrial controllers at Iran's Natanz enrichment plant and quietly destroy the centrifuges spinning there.

Zetter was among the first journalists on the story, and in July 2011 she published How Digital Detectives Deciphered Stuxnet, a Wired feature that opened with inspectors noticing in January 2010 that something was wrong at Natanz and followed the researchers who picked the code apart.

Years more of reporting became Countdown to Zero Day: Stuxnet and the Launch of the World's First Digital Weapon, published by Crown on November 11, 2014. It chronicled the covert operation launched by the United States and Israel to sabotage Iran's nuclear program, and the moment computer code first caused physical destruction.

The book became the reference everyone else worked from. When Alex Gibney's documentary Zero Days reached theaters in 2016, one reviewer noted that much of its ground had already been mapped in Zetter's book.

Going Independent

After more than a decade on staff at Wired, Zetter struck out on her own, writing for Politico, the New York Times, the Washington Post, Motherboard and The Intercept.

In March 2021 she launched Zero Day, an independent, reader-supported newsletter about hackers, spies and the places where cybersecurity collides with national security. Within weeks she was covering sabotage at an Iranian nuclear plant and the ransomware attack that shut down Colonial Pipeline.

She kept a foot in Wired too. In 2023 she wrote the untold story of the SolarWinds hack, opening with a Volexity investigator who found a second, far more skilled gang of intruders inside a think tank's network, using a backdoor they'd planted three years earlier.

Zetter on Capitol Hill

On July 22, 2025, the House Homeland Security Subcommittee on Cybersecurity and Infrastructure Protection held a hearing on Stuxnet's fifteenth anniversary. Zetter testified alongside Dragos CEO Robert M. Lee, listed on the witness sheet as the author of Countdown to Zero Day and an adjunct professor at Georgetown University.

That fall her newsletter chased a story that read like a sequel to her book. In October 2025 Peter Williams, a 39-year-old former executive at L3Harris's Trenchant division, pleaded guilty in Washington to stealing eight exploits meant for the US and its allies and selling them to a Russian broker for at least $1.3 million. Zetter reported the plea for Wired and followed the case to his sentence of 87 months in prison in February 2026.

Then came the discovery that recast her own book. In May 2026 Zetter reported that researchers had confirmed Fast16, malware found in leaked NSA tools, had been built alongside Stuxnet to sabotage Iran's nuclear weapons simulations, feeding engineers false data so that successful tests looked like failures.

Fifteen years after the first digital weapon, its hidden sibling finally had a name.

Kim Zetter: Still Counting Down

Zetter's career is a reminder that the biggest stories in security are rarely the loudest. The voting machines, the leaked cables, the worm in the centrifuges and the backdoor in SolarWinds all needed someone patient enough to read both the code and the court records.

She still publishes Zero Day from her own shop, still writes for Wired and still gets the call when Congress wants to understand a cyberweapon.

The book was Countdown to Zero Day. The reporting didn't stop at the last page.