Description
Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Adobe | Acrobat Reader | unspecified – ≤ 2020.001.30020, unspecified – ≤ 2021.001.20150, unspecified – ≤ 2017.011.30194, unspecified – ≤ None | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | tor | 0.4.6.5-r0 | — |
| Alpine v3.23 | tor | 0.4.6.5-r0 | — |
| Alpine v3.22 | tor | 0.4.6.5-r0 | — |
| Alpine v3.21 | tor | 0.4.6.5-r0 | — |
| Alpine v3.20 | tor | 0.4.6.5-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | tor | 0.4.6.5-r0 | — |
| Alpine v3.18 | tor | 0.4.6.5-r0 | — |
| Alpine v3.17 | tor | 0.4.6.5-r0 | — |
| Alpine v3.16 | tor | 0.4.6.5-r0 | — |
| Alpine v3.15 | tor | 0.4.6.5-r0 | — |
| Alpine v3.14 | tor | 0.4.5.9-r0 | — |
| Alpine v3.13 | tor | 0.4.4.9-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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dexteon/cve-2021-28550-poc ★ 0 · Nov 12, 2026
Research notes for cve-2021-28550-poc
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.