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CVE-2021-21017: Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2021-21017
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.
Acrobat Acrobat and Reader contain a heap-based buffer overflow vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.

CSIRTS triage

vendor: Adobeproduct: Acrobat and ReaderMemory corruption
What
Acrobat and Reader contain a heap-based buffer overflow vulnerability that could allow an unauthenticated attacker to achieve code execution.
Who is affected
Users of Adobe Acrobat and Reader are affected.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and its exploitation status.
Action
Users should update to the latest version of 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-2021-21017

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-2021-21017coverage & 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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