What is CVE-2024-49147?

CVE-2024-49147 is a critical-severity vulnerability in Microsoft Update Catalog, classified under Deserialization of Untrusted Data. CVSS score: 9.3/10. Published 2024-12-12.

How severe is CVE-2024-49147?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Deserialization in Microsoft Update Catalog

CVE-2024-49147

Deserialization of untrusted data in Microsoft Update Catalog allows an unauthorized attacker to elevate privileges on the website’s webserver.

Vulnerability class: Insecure Deserialization

Published 2024-12-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49147 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2024-49147?: CVE-2024-49147 is a critical-severity vulnerability in Microsoft Update Catalog, classified under Deserialization of Untrusted Data. CVSS score: 9.3/10. Published 2024-12-12.
How severe is CVE-2024-49147?: Critical severity. CVSS v3 base score is 9.3 out of 10.