CVE-2021-21148
Memory Safety in Fedoraproject Fedora 32 … 33
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2021-21148 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Fedoraproject Fedora. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Security Account Manager (T1003.002); ranked in the top 3% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2021-21148 is a heap buffer overflow vulnerability in the V8 JavaScript engine within Google Chrome versions prior to 88.0.4324.150. The flaw, classified under CWE-787 as an out-of-bounds write, resides in the handling of certain JavaScript operations that can lead to heap corruption when processing untrusted input.
A remote attacker can exploit the issue by serving a specially crafted HTML page to a victim, triggering the overflow during V8 execution. With a CVSS score of 8.8, successful exploitation could allow arbitrary code execution or full compromise of the browser process, affecting confidentiality, integrity, and availability without requiring authentication.
Advisories from the Chrome release notes and Fedora package lists recommend immediate upgrade to Chrome 88.0.4324.150 or later stable builds, with corresponding updates distributed through standard channels for affected Linux distributions. A proof-of-concept exploit referencing array transfer bypass techniques has been published, indicating public availability of attack code shortly after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-8539
Vulnerability Data
Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
- CWE(s)
- KEV Date Added
- 03 November 2021
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability scanning and recording can discover out-of-bounds write flaws so they can be remediated.
Patching or replacing vulnerable software directly eliminates known instances of this coding weakness.
Secure-development practices (static analysis, bounds checking, code review) are the primary means of preventing out-of-bounds writes.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.