An analysis of 24 zero-day vulnerability exploits discovered in 2020 revealed that a quarter of them appeared to be closely related derivatives of previously known exploits – meaning they have have been prevented in the first place, had the original bugs been patched correctly.

The findings, from Google Project Zero, highlight a troubling habit that software developers can sometimes fall into: hastily scramble to issue an urgent vulnerability patch, only to move on to the next issue without fully grasping the underlying cause or crafting a wholistic fix. In some cases, the original patch didn’t even work correctly.

In certain instances, malicious actors simply tweaked a couple of lines of code in order to “revive” a particular exploit method in a slightly different form, according to a Project Zero blog post by security researcher Maddie Stone.

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