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CVE-2021-34480
medium
CVSS 6.8
Scripting Engine Memory Corruption Vulnerability
Summary
Scripting Engine Memory Corruption Vulnerability
AI summary snake-internal / snake-template-v1
A weakness called CVE-2021-34480 was discovered in Microsoft.
In plain terms, it is an out-of-bounds write that can let attackers hijack the program.
Severity is Medium (CVSS 6.8/10). Exploitation requires specific conditions but can cause real harm if successful.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Microsoft CVE-2021-34480".
CVE-2021-34480 (Microsoft). Severity: Medium / CVSSv3 6.8. Category: CWE-787.
Response plan:
1. Check the vendor advisory for affected versions and the patched release.
2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2021-34480) in Microsoft. In plain words, it is an out-of-bounds write that can let attackers hijack the program.
📍 Affected scope
Target versions of Microsoft (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Medium (CVSS 6.8/10). Exploitation requires specific conditions but can cause real harm if successful.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-787)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
References
- web https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34480
- web http://packetstormsecurity.com/files/164121/Internet-Explorer-JIT-Optimization-Memory-Corruption.html
- web https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34480
- web https://nvd.nist.gov/vuln/detail/CVE-2021-34480
- web https://github.com/advisories/GHSA-5973-jvgx-r7xh