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Medium severity5.3NVD Advisory· Published May 2, 2022· Updated Jun 17, 2026

CVE-2021-4138

CVE-2021-4138

Description

Improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3

Mozilla Corporation/geckodriver3 versions
cpe:2.3:a:mozilla:geckodriver:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:geckodriver:*:*:*:*:*:*:*:*range: <0.30.0
- (no CPE)range: <=0.30.0
- (no CPE)range: unspecified

Patches

Vulnerability mechanics

References

2

bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredThird Party Advisory
github.com/mozilla/geckodriver/releases/tag/v0.30.0nvdRelease NotesThird Party Advisory

News mentions

0

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