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CVE-2021-21028

Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution

8.8 HighFix available

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

4.29%Down 3.4 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used8.8

Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (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.

Record
CVE-2021-21028
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
EUVDEUVD-2021-05518.8

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (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.

Record
EUVD-2021-0551
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-f92j-qf46-p6vmNo score

Reflected Cross-site Scripting in ACS Commons

Impact

ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly.

An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.

Patches

This issue has been resolved in v4.10.0

Workarounds

No workaround exist.

References

N/A

For more information

If you have any questions or comments about this advisory open an issue in acs-aem-commons.

Credit

This issue was discovered and reported by Christopher Whipp (Christopher.Whipp@servicesaustralia.gov.au).

Record
GHSA-f92j-qf46-p6vm
Weakness
CWE-79, CWE-416
Updated
2026-11-02
NVD8.8

Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (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.

Record
CVE-2021-21028
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.0
8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-416
Updated
2026-11-02
OSVCVE-2021-210436.1

ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly. An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.

Record
CVE-2021-21043
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-7r83-w6r8-fh6w6.1

Reflected Cross-site Scripting (XSS) in ACS Commons

ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly. An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.

Record
GHSA-7r83-w6r8-fh6w
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-787, CWE-79
Updated
2026-11-02
OSVGHSA-f92j-qf46-p6vmNo score

Reflected Cross-site Scripting in ACS Commons

Impact

ACS Commons version 4.9.2 (and earlier) suffers from a Reflected Cross-site Scripting (XSS) vulnerability in version-compare and page-compare due to invalid JCR characters that are not handled correctly.

An attacker could potentially exploit this vulnerability to inject malicious JavaScript content into vulnerable form fields and execute it within the context of the victim's browser. Exploitation of this issue requires user interaction in order to be successful.

Patches

This issue has been resolved in v4.10.0

Workarounds

No workaround exist.

References

N/A

For more information

If you have any questions or comments about this advisory open an issue in acs-aem-commons.

Credit

This issue was discovered and reported by Christopher Whipp (Christopher.Whipp@servicesaustralia.gov.au).

Record
GHSA-f92j-qf46-p6vm
Weakness
CWE-416, CWE-79
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
com.adobe.acs:acs-aem-commons
Maven
before 4.10.0
4.10.0
com.adobe.acs:acs-aem-commons
Maven
From an advisory covering 2 CVEs
before 4.10.0, plus listed versions
4.6.04.7.04.7.24.8.04.8.44.8.64.9.04.9.2
4.10.0

History

History
RecordedChangedSources
aliases
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21028 is a high vulnerability (CVSS 8.8) in Adobe Acrobat, published February 2, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.29%, the 91st percentile. Fixed in com.adobe.acs:acs-aem-commons 4.10.0.

References

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