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CVE-2021-28550: Adobe Acrobat and Reader Use-After-Free Vulnerability

criticalknown exploitedCVE-2021-28550
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.

CSIRTS triage

vendor: Adobeproduct: Acrobat and ReaderRemote code execution
What
A use-after-free vulnerability could allow unauthenticated attackers to execute code.
Who is affected
Users of Adobe Acrobat and Reader.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Adobe Acrobat and Reader.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-28550

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-28550coverage & exploitation statusNVD · CVE.org

Recent advisories for Adobe Acrobat and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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