SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2009-3671

Microsoft Internet Explorer 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka…

HIGH 8.1EPSS 21.0%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 21.0%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

Description

Microsoft Internet Explorer 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability," a different vulnerability than CVE-2009-3674.

CVSS 3.1
8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
21.04% probability · 98th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-399, CWE-416
Affected
microsoft/internet explorer · microsoft/windows 2000 · microsoft/windows server 2003 · microsoft/windows xp · microsoft/windows server 2008 · microsoft/windows vista · microsoft/windows 7
Source
secure@microsoft.com
EPSS trend
0%13%25%26 October 2026: 21.04%26 October 202626 October 2026

EPSS 21.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.