CVE-2021-29370Public exploitNetwork attack vector

Universal cross-site scripting via encoded intent scheme

Published Apr 13, 2021 · Updated Aug 3, 2024

Universal cross-site scripting in Thanos-Soft Cheetah Browser 1.2.0 allows remote attackers to run script in any open site's context. Its Android deep-link handler inadequately filters intent-scheme URLs, allowing a double-encoded carriage return to bypass the JavaScript-scheme check. A victim must have a site open in the integrated browser and click a crafted link in another browser; injected script then inherits the open site's origin.

CVSS severity6.1
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Universal cross-site scripting in Thanos-Soft Cheetah Browser 1.2.0 allows remote attackers to run script in any open site's context. Its Android deep-link handler inadequately filters intent-scheme URLs, allowing a double-encoded carriage return to bypass the JavaScript-scheme check. A victim must have a site open in the integrated browser and click a crafted link in another browser; injected script then inherits the open site's origin.

The record

CVE
CVE-2021-29370
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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