CVE Exploit Alert: CVE-2012-1854 | HIGH | CVSS 7.8 | Microsoft Visual Basic for Applications (VBA)

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🟠 HIGH

Severity Overview

  • CVSS Base Score: 7.8
  • Severity: HIGH
  • CVSS Version: 3.1
  • Priority: Elevated priority

Summary

Untrusted search path vulnerability in VBE6.dll in Microsoft Office 2003 SP3, 2007 SP2 and SP3, and 2010 Gold and SP1; Microsoft Visual Basic for Applications (VBA); and Summit Microsoft Visual Basic for Applications SDK allows local users to gain privileges via a Trojan horse DLL in the current working directory, as demonstrated by a directory that contains a .docx file, aka “Visual Basic for Applications Insecure Library Loading Vulnerability,” as exploited in the wild in July 2012.

Analyst Takeaway

This vulnerability is already in CISA KEV, which means exploitation has been observed in the wild and the issue should be treated as active risk rather than theoretical exposure. Microsoft Visual Basic for Applications (VBA) is associated with technology that is commonly deployed in enterprise environments, so defenders should assume a higher probability of broad target interest and prioritize validation across the environment. The ATT&CK mapping suggests public-facing exploitation risk, so external exposure validation should be part of immediate triage. In parallel with patching, defenders should review external exposure, hunt for signs of exploitation, and validate whether compensating controls are in place for vulnerable assets.

MITRE ATT&CK Mapping

  • T1195.002 – Compromise Software Supply Chain
    Rationale: The vulnerability context suggests compromise of software or its delivery/update path.
  • T1203 – Exploitation for Client Execution
    Rationale: The vulnerability appears tied to a client application such as a browser, document handler, or end-user productivity software.
  • T1190 – Exploit Public-Facing Application
    Rationale: The product appears likely to be internet-facing or commonly exposed in enterprise environments.

Detection Guidance

  • T1195.002 – Software Supply Chain Compromise

    • Validate integrity of software updates, packages, and repositories associated with the affected product.
    • Review CI/CD activity, build pipelines, package download logs, and artifact trust controls.
    • Investigate anomalies related to update sources, code signing, or dependency provenance.
    • Confirm that affected software was sourced from trusted channels and has not been replaced or tampered with.
  • T1203 – Exploitation for Client Execution

    • Inspect endpoint telemetry for suspicious execution chains involving browsers, Office apps, PDF readers, or other client software.
    • Look for child processes spawned from user-facing applications, especially PowerShell, cmd.exe, wscript, cscript, or mshta.
    • Review email attachment and download activity associated with the affected software.
    • Investigate unusual script execution, LOLBin usage, or user-driven process launches immediately following file open events.
  • T1190 – Exploit Public-Facing Application

    • Inspect web server, reverse proxy, load balancer, and WAF logs for abnormal requests.
    • Look for unusual requests to uncommon URIs, exploit strings, or suspicious POST activity.
    • Monitor for spikes in HTTP 4xx/5xx responses that may indicate probing or failed exploitation attempts.
    • Review outbound connections from affected servers for unexpected command-and-control or secondary payload retrieval.
    • Validate which internet-facing assets are running the vulnerable product and whether compensating controls exist.

Hunting Considerations

  • Search SIEM and EDR data for activity aligned to the mapped ATT&CK techniques.
  • Correlate endpoint, network, identity, and application telemetry for signs of exploitation and post-exploitation behavior.
  • Prioritize internet-facing systems, externally reachable management interfaces, and assets handling sensitive data.
  • Investigate unexpected process creation, service changes, outbound connections, or authentication anomalies on affected hosts.

Key Details

  • CVE: CVE-2012-1854
  • Vendor: Microsoft
  • Product: Visual Basic for Applications (VBA)
  • CWE: CWE-426
  • Date Added to CISA KEV: 2026-04-13
  • CISA Due Date: 2026-04-27
  • Known Ransomware Campaign Use: Unknown

Technical Severity Details

  • CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Why This Matters

This vulnerability is included in CISA’s Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. Based on the available NVD scoring, this issue should be treated as elevated priority.

Recommended Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Additional Notes

https://learn.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-046 ; https://nvd.nist.gov/vuln/detail/CVE-2012-1854