Calling all security researchers, engineers, and developers: Zerodium is offering three $1 million rewards for remote iOS 9 exploits.

"Apple iOS, like all operating system[s], is often affected by critical security vulnerabilities," Zerodium said in an announcement. "However due to the increasing number of security improvements and the effectiveness of exploit mitigations in place, Apple's iOS is currently the most secure mobile OS.

"But don't be fooled, secure does not mean unbreakable, it just means that iOS has currently the highest cost and complexity of vulnerability exploitation," the company continued. "And here's where the Million Dollar iOS 9 Bug Bounty comes into play."

Of the $3 million prize money, $1 million will go to each individual or team that creates and submits an "exclusive, browser-based, and untethered jailbreak" for iOS 9.

Zerodium says the initial attack vector must be a Web page targeting the mobile browser or any application reachable through the browser, or a text message delivered via a SMS OR MMS. Plus, the exploitation process should be achievable "remotely, reliably, silently, and without requiring any user interaction" except visiting a website or reading a message, Zerodium said.

Though attack vectors such as physical access, Bluetooth, NFC, or baseband are not eligible, the security firm might consider them separately.

Most importantly, the jailbreak must work reliably on the iPhone 6s, 6s Plus, 6, 6 Plus, 5, 5c, and 5s, as well as iPad Air 2, iPad Air, fourth-gen iPad, third-gen iPad, iPad mini 4, and iPad mini 2.

The program is open until Oct. 31 at 6 p.m. Eastern. But keep an eye on Zerodium's website, as the bug bounty may end early, once the $3 million payout is depleted.

Engadget, however, warns hackers to beware of Zerodium: founder Chaouki Bekrar has a history of selling exploits to the highest bidder, rather than disclosing issues to the manufacturer, according to the tech blog. In fact, Zerodium does not want these vulnerabilities patched—at least not until it can resell them for a profit, Engadget said.

Zerodium did not immediately respond to a request for comment.

Apple's iOS 9 launched last week with a range of new features, as well as bug fixes and new apps like News. The operating system also has a redesigned Notes service and includes transit information for its Maps navigation program. As of Monday, it was running on more than 50 percent of iDevices currently in the wild.

Zerodium's campaign, meanwhile, comes after Apple was forced to pull several apps from its App Store after legitimate apps were infected with malware. Developers reportedly used an unstable version of Apple's Xcode developer software.

For more, see Before and After iOS 9: What's Different?

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