Is CVE-2012-1889 in the CISA KEV catalog?

Yes. CVE-2012-1889 is on the CISA Known Exploited Vulnerabilities list, added 2022-06-08.

What is the CVSS severity of CVE-2012-1889?

CVE-2012-1889 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2012-1889?

CVE-2012-1889 has an EPSS score of 83.64% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2012-1889?

No published fix for CVE-2012-1889 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-06-22. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2012-1889

HIGHCISA KEVEPSS 100th pctl

8.8

CVSS v3

NVD

Description

Microsoft XML Core Services 3.0, 4.0, 5.0, and 6.0 accesses uninitialized memory locations, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

CWE-787Out-of-bounds Write

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-06-22

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

83.64%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft XML Core Services Memory Corruption Vulnerability

Microsoft XML Core Services contains a memory corruption vulnerability which could allow for remote code execution.

Apply updates per vendor instructions.

Remediation due: 2022-06-22

References

Patch1

docs.microsoft.com

Vendor Advisory1

technet.microsoft.com

Third-Party Advisory2

Government Resource1

cisa.gov

Other references1

oval.cisecurity.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.