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Critical

Internet Explorer 10 and 11 Memory Corruption Vulnerability

IdentifiersCVE-2015-0039CWE-119

CVE-2015-0039 is a memory corruption vulnerability in Microsoft Internet Explorer 10 and 11. According to the provided content, a remote attacker can trigger the flaw by enticing a user to visit a specially crafted web page. The issue is described by Microsoft as an "Internet Explorer Memory Corruption Vulnerability" and is distinct from CVE-2015-0027, CVE-2015-0035, CVE-2015-0052, and CVE-2015-0068. The underlying defect involves improper handling of objects in memory, which can lead to memory corruption during webpage processing.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow remote code execution in the security context of the current user, or alternatively cause a denial of service through memory corruption. If the logged-in user has administrative privileges, the attacker may gain the ability to install programs, modify data, create accounts, or otherwise fully compromise the affected system. Systems used for routine web browsing are at higher risk.

Mitigation

If you can’t patch tonight, do this now.

The provided content states Microsoft identified no specific mitigating factors and no workarounds for the memory corruption vulnerabilities. Practical exposure reduction includes limiting user privileges and reducing browsing to untrusted or attacker-controlled content. On Windows Server platforms, Internet Explorer Enhanced Security Configuration reduces exposure to specially crafted web content, which is why server editions were generally rated lower severity.

Remediation

Patch, then assume compromise.

Apply Microsoft's February 2015 Internet Explorer security update 3034682 and associated required updates. The provided content states that for Internet Explorer 9, 10, and 11, both update 3021952 and update 3034196 are required for full protection, with Microsoft noting that 3021952 should be installed before 3034196 when installed manually. On some platforms, installing 3021952 also installs updates 3023607 and 3036197 automatically. Updating to the vendor-fixed version is the primary remediation.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft CorporationInternet Explorerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2015-0039
NVD
nvd.nist.gov/vuln/detail/CVE-2015-0039
MITRE CWE · CWE-119
cwe.mitre.org
securityfocus.com
securityfocus.com/bid/72409
securitytracker.com
securitytracker.com/id/1031723
docs.microsoft.com
docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-009