CVE-2021-21220 is a high-severity vulnerability found in Google Chrome's V8 JavaScript engine, specifically affecting versions prior to 89.0.4389.128. This vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. Given the potential impact, organizations should prioritize addressing this vulnerability immediately.
With a CVSS score of 8.8, this vulnerability is classified as high. The severity is justified by the combination of attack vector, low complexity, and the requirement for user interaction, indicating that users may unknowingly expose themselves to risk. The wide usage of the affected product across various environments further elevates the urgency for remediation.
Understanding the real-world implications is crucial; attackers leveraging this vulnerability can compromise the integrity, confidentiality, and availability of affected systems. Organizations must assess their exposure and take necessary actions to safeguard against potential exploitation.
As of now, the vulnerability is listed in the Known Exploited Vulnerabilities (KEV) catalog, underscoring its critical nature. Organizations should prioritize patching and follow vendor guidance to mitigate the risks associated with this vulnerability.
Vulnerability Details
The vulnerability stems from insufficient validation of untrusted input in the V8 engine. As described in the official CVE documentation, it allows attackers to exploit heap corruption, which could lead to arbitrary code execution. This vulnerability affects multiple products that utilize the Chromium engine, including various web browsers.
The CVSS version 3.1 score of 8.8 signifies a high risk due to its network attack vector and low complexity, which means it can be exploited without significant technical skill. The vulnerability was published on April 26, 2021, and pertinent details can be referenced under CWE-787.
Technical Analysis
The root cause of this vulnerability is a lack of proper input validation in the V8 engine, which can lead to heap corruption. The attack vector is through the network, where an attacker can exploit this vulnerability by convincing a user to visit a specially crafted page. The attack complexity is low, requiring no special privileges, although user interaction is necessary.
Once exploited, the vulnerability can lead to high impacts on confidentiality, integrity, and availability. Organizations that have deployed affected versions of Google Chrome or browsers utilizing Chromium need to be particularly vigilant.
Risk & Impact Analysis
The risks associated with CVE-2021-21220 are significant, especially for organizations relying on Google Chrome or Chromium-based browsers. The ability for attackers to exploit heap corruption remotely poses a direct threat to organizational assets, data confidentiality, and overall operational integrity.
Organizations should evaluate their exposure and the potential blast radius of this vulnerability. The urgency to remediate is underscored by its classification in the KEV catalog, indicating known exploitation in the wild. Immediate actions should be taken to address this vulnerability to prevent possible breaches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions of Google Chrome include all versions prior to 89.0.4389.128. Additionally, various Fedora versions including 32, 33, and 34 are also impacted. Organizations are advised to check their deployments against these version criteria.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest vendor patches as per vendor instructions as soon as possible. If patching is not feasible, consider implementing network controls to minimize exposure to potentially crafted HTML pages. Continuous monitoring for anomalous behaviors can also aid in detection.
For a comprehensive assessment of security posture, organizations should consider engaging in penetration testing to identify similar weaknesses in their systems.
Detection Guidance
Organizations should monitor for signs of exploitation, which may include unusual application crashes or unexpected behavior in web browsers. Additionally, logging network traffic for requests to untrusted or suspicious web pages can help identify potential attacks leveraging this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2021-21220 represents a concerning trend in web browser vulnerabilities, highlighting the ongoing challenges associated with input validation and heap management in modern software. Security teams must remain vigilant and proactive in their assessments and remediation efforts.
To enhance security posture and preparedness, organizations are encouraged to review their current vulnerability management programs and update their incident response plans accordingly.
Additionally, adopting a strategy of continuous security testing can help identify weaknesses before they are exploited. Engaging in penetration testing methodology will provide insightful data that can guide future security enhancements.
Finally, organizations should explore options for API security testing to ensure comprehensive coverage against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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