CVE-2021-28550
Adobe Acrobat and Reader: Use-After-Free
As of , CVE-2021-28550 in Adobe Acrobat and Reader is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 17 November 202114 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.52Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.
CISA's 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.
The CVE record's description, from adobe
- CVE published
- 2 September 2021
- Assigned by
- adobe
- CVSS
- 9.6 Critical (CVSS 3.0, from the CNA)
- CWE-416
- Use After Free
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Acrobat and Reader: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2009-3459Heap-Based Buffer Overflow | Adobe Acrobat and Reader | Patch this weekMetasploit module; EPSS 0.87; verified Exploit-DB entry | 0.87 | ||
| CVE-2007-5659Buffer Overflow | Adobe Acrobat and Reader | Patch this weekMetasploit module; EPSS 0.87; verified Exploit-DB entry | 0.87 | ||
| CVE-2009-3953Universal 3D Remote Code Execution | Adobe Acrobat and Reader | Patch this weekMetasploit module; EPSS 0.83; verified Exploit-DB entry | 0.83 | ||
| CVE-2009-4324Use-After-Free | Adobe Acrobat and Reader | Patch this weekMetasploit module; EPSS 0.82; verified Exploit-DB entry | 0.82 | ||
| CVE-2010-2883Stack-Based Buffer Overflow | Adobe Acrobat and Reader | Patch this weekMetasploit module; EPSS 0.81; verified Exploit-DB entry | 0.81 | ||
| CVE-2008-2992Reader and Acrobat Input Validation | Adobe Acrobat and Reader | Patch this weekRansomware use; Metasploit module; EPSS 0.98; verified Exploit-DB entry | 0.98 | ||
| CVE-2023-21608Use-After-Free | Adobe Acrobat and Reader | Patch this weekEPSS 0.61 | 0.61 | ||
| CVE-2021-21017Heap-based Buffer Overflow | Adobe Acrobat and Reader | Patch this weekEPSS 0.86 | 0.86 | ||
| CVE-2008-0655Unspecified | Adobe Acrobat and Reader | Patch soon | 0.38 | ||
| CVE-2018-4990Double Free | Adobe Acrobat and Reader | Patch soon | 0.36 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org