{"id":"CVE-2021-21028","aliases":["EUVD-2021-0551","GHSA-f92j-qf46-p6vm"],"status":"published","title":"Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution","description":"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.","severity":{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.04295,"percentile":0.91262,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416","CWE-787","CWE-79"],"published":"2021-02-02T15:46:52Z","modified":"2026-10-20T10:54:30Z","fixes":[{"ecosystem":"Maven","package":"com.adobe.acs:acs-aem-commons","fixed_in":["4.10.0"],"sources":["ghsa"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"com.adobe.acs:acs-aem-commons","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"com.adobe.acs:acs-aem-commons","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10.0"}]}],"versions":["4.6.0","4.7.0","4.7.2","4.8.0","4.8.4","4.8.6","4.9.0","4.9.2"],"bundled":2},{"source":"osv","ecosystem":"Maven","package":"com.adobe.acs:acs-aem-commons","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10.0"}]}],"versions":["4.6.0","4.7.0","4.7.2","4.8.0","4.8.4","4.8.6","4.9.0","4.9.2"],"bundled":2}],"products":[{"vendor":"adobe","product":"acrobat"},{"vendor":"adobe","product":"acrobat reader"},{"vendor":"adobe","product":"acrobat_dc"},{"vendor":"adobe","product":"acrobat_reader"},{"vendor":"adobe","product":"acrobat_reader_dc"}],"references":[{"url":"https://helpx.adobe.com/security/products/acrobat/apsb21-09.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","web"]},{"url":"https://github.com/Adobe-Consulting-Services/acs-aem-commons/security/advisories/GHSA-f92j-qf46-p6vm","tags":["advisory","web"]},{"url":"https://github.com/Adobe-Consulting-Services/acs-aem-commons/commit/14d769c86606c4ce9a93c47a19f87e1ad72788d6","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21028","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f92j-qf46-p6vm"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21043","tags":["advisory"]},{"url":"https://github.com/Adobe-Consulting-Services/acs-aem-commons","tags":["package"]},{"url":"https://helpx.adobe.com/security/products/indesign/apsb21-22.html","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-21028","title":"Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution","description":"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.","status":"published","published":"2021-02-11T19:42:20.96Z","modified":"2024-09-17T03:58:50.05Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-0551","description":"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.","status":"published","published":"2021-02-11T19:42:20Z","modified":"2024-09-17T03:58:50Z","cvss":[{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:28:27.115818Z"}],"ghsa":[{"id":"GHSA-f92j-qf46-p6vm","title":"Reflected Cross-site Scripting in ACS Commons","description":"### Impact\n\nACS 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.\n\nAn 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.\n\n### Patches\n\nThis issue has been resolved in v4.10.0\n\n### Workarounds\n\nNo workaround exist.\n\n### References\n\nN/A\n\n### For more information\n\nIf you have any questions or comments about this advisory open an issue in acs-aem-commons.\n\n### Credit\n\nThis issue was discovered and reported by Christopher Whipp (Christopher.Whipp@servicesaustralia.gov.au).","status":"published","published":"2021-02-02T15:46:52Z","modified":"2023-02-01T05:05:05Z","cwes":["CWE-79","CWE-416"],"updated_at":"2026-11-02T14:36:32.918681Z"}],"nvd":[{"id":"CVE-2021-21028","description":"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.","status":"published","published":"2021-02-11T20:15:14.7Z","modified":"2026-06-17T03:34:41.437Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":8.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"CVE-2021-21043","description":"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.","status":"published","published":"2021-02-02T23:15:12.813Z","modified":"2026-10-20T10:54:30.333385981Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"GHSA-7r83-w6r8-fh6w","title":"Reflected Cross-site Scripting (XSS) in ACS Commons","description":"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.","status":"published","published":"2021-05-13T22:31:14Z","modified":"2026-07-08T06:49:39.79473616Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-787","CWE-79"],"updated_at":"2026-11-02T15:46:41.349637Z"},{"id":"GHSA-f92j-qf46-p6vm","title":"Reflected Cross-site Scripting in ACS Commons","description":"### Impact\n\nACS 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.\n\nAn 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.\n\n### Patches\n\nThis issue has been resolved in v4.10.0\n\n### Workarounds\n\nNo workaround exist.\n\n### References\n\nN/A\n\n### For more information\n\nIf you have any questions or comments about this advisory open an issue in acs-aem-commons.\n\n### Credit\n\nThis issue was discovered and reported by Christopher Whipp (Christopher.Whipp@servicesaustralia.gov.au).","status":"published","published":"2021-02-02T15:46:52Z","modified":"2026-07-08T06:49:39.79473616Z","cwes":["CWE-416","CWE-79"],"updated_at":"2026-11-02T15:46:46.006631Z"}]}}