CVE-2023-6210Public exploitNetwork attack vector

Insecure iframe loading via javascript pop-up

Published Nov 21, 2023 · Updated Feb 13, 2025

Mixed-content bypass in Mozilla Firefox before 120 allows remote attackers to load insecure HTTP iframes from a secure page. The Mixed Content Blocker failed to check whether the pop-up's root document was a secure context before allowing the nested HTTP load. Exploitation requires the site's pop-up permission and attacker-controlled HTTPS content; the user receives no indication that the iframe is insecure.

CVSS severity6.5
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Mixed-content bypass in Mozilla Firefox before 120 allows remote attackers to load insecure HTTP iframes from a secure page. The Mixed Content Blocker failed to check whether the pop-up's root document was a secure context before allowing the nested HTTP load. Exploitation requires the site's pop-up permission and attacker-controlled HTTPS content; the user receives no indication that the iframe is insecure.

The record

CVE
CVE-2023-6210
Published
Nov 21, 2023
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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 <120

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <120

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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.

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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

T1189Drive-by Compromise

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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