Skip to main content
Mallory
Back to vulnerabilities
High

Remote Code Execution in Microsoft Edge (Chromium-based)

IdentifiersCVE-2025-59251

CVE-2025-59251 is a remote code execution vulnerability in Microsoft Edge (Chromium-based), disclosed on 2025-09-24 and referenced by the Microsoft Security Update Guide. Available public information identifies the issue only at a high level as an Edge RCE with a CVSS score of 7.6. Public sources provided in the content do not disclose the technical root cause, vulnerable function or code path, affected version range, or a confirmed exploitation mechanism. Based on the available information, it should be treated as a browser-side RCE issue in Edge that may be reachable through malicious web content, but specific implementation details are currently not available.

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

Start free trial
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 could allow remote code execution in the context of the affected Microsoft Edge process. In practical terms, this could enable compromise of the browsing endpoint through malicious web content, potentially leading to execution of attacker-controlled code, theft of data accessible to the browser context, installation of additional payloads, or use of the browser foothold as a step toward broader endpoint compromise. The precise impact beyond browser-context code execution is not publicly detailed in the provided sources.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting access to untrusted or high-risk web content, enforcing browser isolation or sandboxing controls where available, restricting execution of active content through enterprise browser policies, and monitoring for suspicious browser child-process activity or anomalous endpoint behavior originating from Edge. These are general mitigations for browser RCE exposure; no vulnerability-specific workaround is provided in the available public information.

Remediation

Patch, then assume compromise.

Apply the Microsoft security update for Microsoft Edge associated with CVE-2025-59251 as provided through Microsoft's Edge security releases and the Microsoft Security Update Guide. Because the affected version range is not specified in the provided content, organizations should update Edge to the latest available patched release and verify deployment across enterprise-managed and consumer systems. Standard remediation should also include confirming successful browser restart and update application on all affected endpoints.
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 CorporationEdge Chromiumapplication

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

ACTIVITY FEED

Recent activity

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

6 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.
Start free trial
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 activity5

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2025-59251
NVD
nvd.nist.gov/vuln/detail/CVE-2025-59251
Vendor Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59251