Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2021-34448 is a medium-severity Out-of-bounds Write (CWE-787) vulnerability in Microsoft Windows Server 2012. Its CVSS base score is 6.8 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Security Account Manager (T1003.002); ranked in the top 1% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
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-2021-34448 is a Scripting Engine Memory Corruption Vulnerability, identified by CWE-787 and carrying a CVSS 3.1 score of 6.8 reflecting network attack vector, high attack complexity, no required privileges, and required user interaction. The affected component is the scripting engine in Microsoft products.
An unauthenticated remote attacker can exploit the flaw by delivering specially crafted content that a user must interact with, resulting in memory corruption that yields high impact to confidentiality and integrity while leaving availability unaffected.
Microsoft has published an advisory detailing the issue at the referenced MSRC portal, and the vulnerability appears in CISA's catalog of known exploited vulnerabilities.
Its inclusion in the CISA catalog indicates confirmed real-world exploitation activity.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-21103
Vulnerability Data
Scripting Engine Memory Corruption Vulnerability
- 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.