PT-2021-3565 · Google+3 · V8 Engine+4

Bkth + 3 · Published 2021-04-07 · Updated 2025-10-24 · CVE-2021-21220

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Google Chrome versions prior to 89.0.4389.128

Description The issue is related to insufficient validation of untrusted input in the V8 engine of Google Chrome, which could allow a remote attacker to potentially exploit heap corruption via a crafted HTML page. This could lead to unauthorized access to confidential information or cause a denial of service. The vulnerability has been reportedly exploited by actors such as Water Labbu in Electron-based applications, particularly targeting the financial industry.

Recommendations For Google Chrome versions prior to 89.0.4389.128, update to version 89.0.4389.128 or later to resolve the issue. As a temporary workaround, consider restricting access to potentially vulnerable API endpoints or disabling the use of untrusted input in the V8 engine until a patch is applied. Avoid using crafted HTML pages that could exploit the heap corruption vulnerability.

Exploit

Fix

Memory Corruption

Buffer Overflow

Weakness Enumeration

CWE-787

CWE-119

Related Identifiers

ALSA-2025_16880

ALT-PU-2021-1667

ALT-PU-2021-1972

ALT-PU-2021-2007

ALT-PU-2021-2009

ALT-PU-2021-2141

BDU:2021-03664

CVE-2021-21220

OPENSUSE-SU-2021:0567-1

OPENSUSE-SU-2021:0575-1

OPENSUSE-SU-2021:0712-1

OPENSUSE-SU-2021_0567-1

OPENSUSE-SU-2021_0712-1

OPENSUSE-SU-2024:10681-1

OPENSUSE-SU-2024:12948-1

ZDI-21-411

Affected Products

Alt Linux

Astra Linux

Google Chrome

Suse

V8 Engine

References · 2362

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation.rb · Exploit
• 🔥 https://github.com/security-dbg/CVE-2021-21220 · Exploit
• 🔥 http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html · Exploit
• 🔥 https://crbug.com/1196683 · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03664 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2022-0114SE47 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-411 · Security Note
• https://ubuntu.com/security/CVE-2021-21220 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:12948-1 · Vendor Advisory
• https://security.gentoo.org/glsa/202104-08 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21220 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2021:0575-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-21220 · Vendor Advisory