Microsoft Internet Explorer Messaging API Information Disclosure Vulnerability

Microsoft Internet Explorer 9 through 11 and the Internet Messaging API in Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allow remote attackers to determine the existence of arbitrary files via a crafted web…

CheckOps priority index

6.0/10 Patch within 7 days

Severity6.5

Probability3.3

Exploitation4/5

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

EPSS · today 33.3% higher than 98.4% of CVEs

CVSS 3.1 6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:

Exploited for 1,624 days 24 May 2022

CISA due date 14 Jun 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)24 May 2022
Exploited in EUVD (ENISA)24 May 2022
Used by ransomwareno
EPSS above 10 %33.3%
No account, over the networkyes

What to do

Fix

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

CISA guidance: Apply updates per vendor instructions.

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

Affected products

Internet Explorer

Weaknesses (CWE)

CWE-200

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

14 Oct 2016
Published
24 May 2022
Exploitation reported (ENISA)
24 May 2022
Added to the KEV catalog
14 Jun 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 33.3%

References

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