Microsoft Windows Out-of-Bounds Write Vulnerability

CheckOps priority index

8.1/10 Patch within 24 h

Severity8.8

Probability7.4

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 73.7% higher than 99.5% of CVEs

CVSS 3.1 8.8 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:

Exploited for 393 days 06 Oct 2025

CISA due date 27 Oct 2025 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)06 Oct 2025
Exploited in EUVD (ENISA)06 Oct 2025
Used by ransomwareno
EPSS above 10 %73.7%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

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

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

The InformationCardSigninHelper Class ActiveX control in icardie.dll in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds write) via a crafted web page that is accessed by Internet Explorer, as exploited in the wild in November 2013, aka "InformationCardSigninHelper Vulnerability."

Affected products

Windows

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

12 Nov 2013
Published
06 Oct 2025
Exploitation reported (ENISA)
06 Oct 2025
Added to the KEV catalog
27 Oct 2025
CISA remediation due date
26 Sept 2026
EPSS peak: 73.7%

References

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