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CVE Record

CVE-2021-33595: F-Secure Safe browser for iOS vulnerable to Address Bar Spoofing

A address bar spoofing vulnerability was discovered in Safe Browser for iOS. Showing the legitimate URL in the address bar while loading the content from other domain. This makes the user believe that the content is served by a legit domain. A remote attacker can leverage this to perform address bar spoofing attack.

LowCVSS 3.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2021-33595 is a low-severity spoofing issue in F-Secure Safe Browser for iOS, associated with F-Secure Mobile Security 18.4x. A user could see a legitimate-looking address while content comes from another domain, increasing phishing risk. It does not indicate data theft or system compromise by itself.

Executive priority

Treat this as a low-priority but real phishing-enablement issue. It does not suggest broad compromise, but managed iOS fleets using the affected F-Secure browser should be inventoried and updated according to vendor guidance.

Technical view

The flaw is address bar spoofing: the browser may display a legitimate URL while rendering content from a different domain. CVSS 3.1 is 3.5 with network access, low complexity, required privileges, required user interaction, no confidentiality impact, low integrity impact, and no availability impact.

Likely exposure

Exposure appears limited to organizations or users running F-Secure Mobile Security 18.4x with Safe Browser on iOS. The supplied sources do not identify other affected products, platforms, or versions.

Exploitation context

The source bundle does not report active exploitation, and the CVE is not listed as KEV. Practical risk is mainly phishing or user deception where trust in the displayed address bar influences decisions.

Researcher notes

No CWE, fixed version, exploit proof, or detailed remediation is present in the supplied evidence. Do not expand affected scope beyond F-Secure Mobile Security 18.4x and Safe Browser for iOS based on these sources alone.

Mitigation direction

  • Inventory iOS devices for F-Secure Mobile Security 18.4x.
  • Check F-Secure advisory guidance for fixed or supported versions.
  • Update or replace affected installations where vendor guidance supports it.
  • Avoid using affected Safe Browser builds for sensitive login workflows.
  • Warn users not to rely only on the in-app address bar.

Validation and detection

  • Use MDM or endpoint inventory to identify affected iOS app versions.
  • Confirm affected devices are updated, removed, or otherwise addressed.
  • Review F-Secure advisory pages for version-specific remediation details.
  • Check security reports for phishing involving the affected browser.
  • Document any remaining unsupported or unpatched installations.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-33595 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
3.5CVSS 3.1LowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N2.11.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

3.5Low
CVSS 3.1 vector shape for CVE-2021-33595Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
F-SecureF-Secure Mobile Security18.4xListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.