CVE-2021-21017: Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability
CVE-2021-21017 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03
Adobe Acrobat and Reader are vulnerable to a heap-based buffer overflow when processing malicious files. An unauthenticated attacker can achieve arbitrary code execution in the context of the current user if a victim opens a specially crafted file.
Yes. CVE-2021-21017 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-21017?
Critical severity, with a CVSS score of 8.8, published 3 November 2021.
Which products and versions are affected?
Adobe Acrobat Reader DC 2020.013.20074 (and earlier); Adobe Acrobat Reader DC 2020.001.30018 (and earlier); Adobe Acrobat Reader DC 2017.011.30188 (and earlier); Adobe Acrobat DC 2020.013.20074 (and earlier); and 2 more.
Is there a fix for CVE-2021-21017?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-21017 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-21017?
Check whether you run Adobe Acrobat or Adobe Reader. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
Adobe Acrobat Reader DC 2020.013.20074 (and earlier)
Adobe Acrobat Reader DC 2020.001.30018 (and earlier)
Adobe Acrobat Reader DC 2017.011.30188 (and earlier)