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CVE-2021-42564

MEDIUM
5.4
CVSS Score
Published: November 30, 2021 at 07:15 PM UTC
Updated: June 17, 2026 at 04:09 AM UTC
1 product affected across 1 vendorCryptshare Server

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.7%

Description

An open redirect through HTML injection in confidential messages in Cryptshare before 5.1.0 allows remote attackers (with permission to provide confidential messages via Cryptshare) to redirect targeted victims to any URL via the '<meta http-equiv="refresh"' substring in the editor parameter.

Affected

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

Cryptshare Server· Cryptshare
95%
v < 5.1.0
Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement

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 (1)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-057.txt

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-601

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