CVE-2021-44749Network attack vector

Arbitrary code execution via improper URL handling

Published Mar 6, 2022 · Updated Aug 4, 2024

Universal cross-site scripting in F-Secure SAFE Browser for Android 18.5 allows remote attackers to execute code through crafted web content. Browser protection mishandles a crafted URL while processing browsed content, allowing attacker-controlled script to cross normal page-origin boundaries. A user must interact with the malicious content; successful exploitation exposes session cookies and allows arbitrary code execution in the browser context.

CVSS severity5.5
Medium
EPSS probability0.82%
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 F-Secure SAFE Browser for Android 18.5 allows remote attackers to execute code through crafted web content. Browser protection mishandles a crafted URL while processing browsed content, allowing attacker-controlled script to cross normal page-origin boundaries. A user must interact with the malicious content; successful exploitation exposes session cookies and allows arbitrary code execution in the browser context.

The record

CVE
CVE-2021-44749
Published
Mar 6, 2022
Updated
Aug 4, 2024
Vendor
F-Secure
Product
F-Secure SAFE Browser for Android
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <18.5x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

F-Secure · F-Secure SAFE Browser for Androidversion=unspecified <18.5x

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
5.5F-SecureCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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