CVE-2021-21220
Google Chromium V8: Improper Input Validation
As of , CVE-2021-21220 in Google Chromium V8 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
- 0.70Higher than 99% 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
- 1 Metasploit module
- 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
Google Chromium V8 Engine contains an improper input validation vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
CISA's description
Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
The CVE record's description, from Chrome
- CVE published
- 26 April 2021
- Assigned by
- Chrome
- CVSS
- 8.8 High (CVSS 3.1, from CISA-ADP)
- CWE-787
- Out-of-bounds Write
- CWE-20
- Improper Input Validation
- CWE-122
- Heap-based Buffer Overflow
- 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.
Public exploits
Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.
- Metasploit: Google Chrome versions before 89.0.4389.128 V8 XOR Typer Out-Of-Bounds Access RCEexploit module, rank manual
Chromium V8: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2018-17463Remote Code Execution | Google Chromium V8 | Patch this weekMetasploit module; EPSS 0.85; verified Exploit-DB entry | 0.85 | ||
| CVE-2019-5825Out-of-Bounds Write | Google Chromium V8 | Patch this weekMetasploit module; EPSS 0.56; verified Exploit-DB entry | 0.56 | ||
| CVE-2020-6418Type Confusion | Google Chromium V8 | Patch this weekMetasploit module; EPSS 0.79; verified Exploit-DB entry | 0.79 | ||
| CVE-2018-6065Integer Overflow | Google Chromium V8 | Patch this weekEPSS 0.60; verified Exploit-DB entry | 0.60 | ||
| CVE-2021-21224Type Confusion | Google Chromium V8 | Patch this weekEPSS 0.84 | 0.84 | ||
| CVE-2021-30551Type Confusion | Google Chromium V8 | Patch this weekEPSS 0.65 | 0.65 | ||
| CVE-2021-30632Out-of-Bounds Write | Google Chromium V8 | Patch this weekEPSS 0.63 | 0.63 | ||
| CVE-2026-85046Type Confusion | Google Chromium V8 | Patch soon | 0.49 | ||
| CVE-2023-4762Type Confusion | Google Chromium V8 | Patch soon | 0.41 | ||
| CVE-2023-3079Type Confusion | Google Chromium V8 | Patch soon | 0.32 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org