What is CVE-2021-33753?

CVE-2021-33753 is a medium-severity vulnerability in Microsoft Bing. CVSS score: 4.7/10. Published 2021-07-14.

How severe is CVE-2021-33753?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Microsoft Bing

CVE-2021-33753

Microsoft Bing Search Spoofing Vulnerability

Published 2021-07-14 · last modified 2026-08-10.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.019 (79.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

References

af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33753 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2021-33753?: CVE-2021-33753 is a medium-severity vulnerability in Microsoft Bing. CVSS score: 4.7/10. Published 2021-07-14.
How severe is CVE-2021-33753?: Medium severity. CVSS v3 base score is 4.7 out of 10.