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CVE-2017-20190

N/A
Published: March 26, 2024 at 12:00 AM UTC
Updated: June 17, 2026 at 01:15 AM UTC
1 product affected across 1 vendorWindows

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Severity
N/A
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a "Zalgo text" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows· Microsoft
60%
8 ≤ v ≤ 118

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: [email protected]
https://aka.ms/windowsbugbar
Source: [email protected]
https://en.wikipedia.org/wiki/Zalgo_text
Source: [email protected]
https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

Quick Info

StatusDEFERRED
CWE
CWE-176

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