Patch intelligence record
Adobe Acrobat Reader 21.001.20155
Review the report sources and test before updating deadline-sensitive work.
Current reports mention browser/plugin handoff failure in browser integration.
Too few reports for a firm verdict yet — treat this as early evidence.
- Accepted reports
- 1
- Latest evidence run
- Sep 9, 2026
- Healthy sources
- 0 fresh (success / no reports) · need 2
- adobe community algolia search Completed last checked Sep 9, 2026
- adobe community search Source request was blocked last checked Jul 26, 2026
- Reddit Source request was blocked last checked Jul 26, 2026
Monitoring reflects community-evidence collection health for this exact release — an absence of reports is not a safety guarantee, and this is separate from the AUXSAYS verdict.
Vendor Known Issues — No vendor-known issue data captured for this patch.
AUXSAYS has not captured official issue data for this patch. This does not indicate the vendor has no issues. Not counted as community reports.
Official Patch Notes — vendor release notes captured from the official source
Adobe Acrobat Reader 21.001.20155 (Continuous track, Windows, macOS). Release date 2021-05-11. Official Adobe Acrobat release note; applies to Adobe Acrobat Reader + Adobe Acrobat Pro.
Adobe Acrobat Reader in these notes: .
Adobe Acrobat Reader 21.001.20155 (Continuous track, Windows, macOS). Release date 2021-05-11. Official Adobe Acrobat release note; applies to Adobe Acrobat Reader + Adobe Acrobat Pro.
Technical Details
- Released
- May 11, 2021
- File size
- Official source checked
- Jul 22, 2026
- Official notes checked
- Jul 22, 2026
Checksum
Use these hashes to verify downloaded installers match the files published with the official release.
User Reports / Sources (1)
User report sources used for the current read.
- Adobe Community. (2021, May 19). Unable to open all embedded attachments from PDF. adobe community bug report Issue: browser/plugin handoff failure in browser integration Workflow: browser integration
Official sources
- Adobe. (2021, May 11). Adobe Acrobat release notes.release notes
- Adobe. (2021, May 11). Adobe Acrobat security bulletins.security advisory
- Adobe. Download page.download
Recent Acrobat reports
1 Not attributed to this update.These issues were reported while this release was current. The reporters did not identify this update as the cause, and they are not counted toward the consensus above.
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Acrobat Reader DC crashes on startup
Reported during the 21.001.20155 release window (May 11, 2021 to Jun 8, 2021).
Patch attribution: not established.