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CVE-2020-27930 is a memory corruption vulnerability in Apple’s handling of Adobe Type 1 Charstring fonts. The flaw is associated with the callothersubr operator in Apple’s implementation of the Type 1 Charstring Font Format, where improper handling of malformed input, including negative argument counts, can corrupt memory during font processing. Apple described the issue as a memory corruption problem addressed through improved input validation. Processing a maliciously crafted font can trigger the flaw and lead to arbitrary code execution. The vulnerability was reported as exploited in the wild and was used in an iOS exploit chain.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apple Safari/iOS font parsing vulnerability in the callothersubr operator of Apple’s Adobe Type 1 Charstring implementation, where negative n values lead to arbitrary stack read/write; described as exploited in the wild and closely related to an older Microsoft ATM flaw.
A zero-day vulnerability allowing arbitrary code execution on the device without user approval.
A vulnerability (CVE-2020-27930) explicitly described as actively exploited in the wild and handled under a 7-day disclosure deadline policy.
A specific vulnerability explicitly described as actively exploited in the wild and handled under a 7-day disclosure deadline.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.