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CVE-2021-33596

17
FAUCET Score

CVE-2021-33596 describes a URL spoofing vulnerability in F-Secure Safe Browser for iOS, where a legitimate URL is displayed while content from a different domain is loaded. This medium-severity vulnerability (CVSS 4.1) requires user interaction, specifically clicking a specially crafted URL containing a malicious redirect, making it a client-side attack with low impact on integrity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, suggesting a low current threat level.

Impacted Technologies

VendorProductVersion(s)CPE
< 18.4.272901CPE matchmatch criteria
cpe:2.3:a:f-secure:safe:*:*:*:*:*:iphone_os:*:*

CVSS Data

CVSS version used by this source: 3.1

3.5LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 88th percentile among its peer group of 15,239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

f-secure.com / en/business/programs/vulnerability-reward-program/hall-of-fame
Vendor Advisory
f-secure.com / en/business/support-and-downloads/security-advisories
Vendor Advisory
f-secure.com / en/business/support-and-downloads/security-advisories/cve-2021-33596
Vendor Advisory