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HomeCVEsCVE-2021-21148

CVE-2021-21148

Published: January 27, 2026
Last updated:2 hours ago (January 27, 2026)
Exploit: YesZero-day: YesPatch: YesTrend: Neutral
TL;DR
Updated January 27, 2026

CVE-2021-21148 is a high severity vulnerability with a CVSS score of 8.8. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.

Key Points
  • 1High severity (CVSS 8.8/10)
  • 2EPSS: 20.00% - high likelihood of exploitation
  • 3Public exploits are available
  • 4Vendor patches are available
  • 5Strobes Priority Score: 970/1000 (Critical)
  • 6Affects products from: Google, Fedoraproject, Debian
Severity Scores
CVSS v38.8
CVSS v26.8
Priority Score970.0
EPSS Score20.0
High
Exploitation LikelihoodHigh
20.00%EPSS

High probability of exploitation in the next 30 days

Prioritize patching within days
20.00%
EPSS
8.8
CVSS
Yes
Exploit
Yes
Patch
Critical Priority
high EPSS • exploit exists • high priority

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

Description

Google Chromium V8 Engine contains a heap buffer overflow 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.

CVSS v3 Breakdown
Attack Vector:Network
Attack Complexity:Local
Privileges Required:Network
User Interaction:Required
Scope:Unchanged
Confidentiality:High
Integrity:High
Availability:High
Exploit References
Cisa.govPacketstormsecurity.comGitHub
Patch References
Chromereleases.googleblog.comZeroday CZ
Trend Analysis
Neutral
Vulnerable Products
VendorProduct
GoogleChrome
FedoraprojectFedora
DebianDebian Linux
Advisories
CISA: Google Chromium V8 Engine contains a heap buffer overflow 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.
GitHub AdvisoryNVD
Cite This Page
APA Format
Strobes VI. (2026). CVE-2021-21148 - CVE Details and Analysis. Strobes VI. Retrieved January 27, 2026, from https://vi.strobes.co/cve/CVE-2021-21148
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