CVE-2022-29910Network attack vector

HSTS enforcement bypass via lost state

Published Dec 22, 2022 · Updated Apr 16, 2025

HSTS enforcement bypass in Mozilla Firefox for Android before 100 allows remote attackers to load HTTP content after saved HSTS state is lost. The browser's DataStorage persistence fails to write SiteSecurityServiceState.txt when the app is backgrounded or closed, so a later HTTP visit is not automatically redirected to HTTPS. Exploitation requires a user to revisit an HSTS-protected site after the state loss; an attacker positioned to serve or intercept HTTP traffic can then obtain plaintext content, while Mozilla reports no direct browser data modification or service interruption.

CVSS severity6.1
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HSTS enforcement bypass in Mozilla Firefox for Android before 100 allows remote attackers to load HTTP content after saved HSTS state is lost. The browser's DataStorage persistence fails to write SiteSecurityServiceState.txt when the app is backgrounded or closed, so a later HTTP visit is not automatically redirected to HTTPS. Exploitation requires a user to revisit an HSTS-protected site after the state loss; an attacker positioned to serve or intercept HTTP traffic can then obtain plaintext content, while Mozilla reports no direct browser data modification or service interruption.

The record

CVE
CVE-2022-29910
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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 <100

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <100

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1Mozilla CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1557Adversary-in-the-Middle

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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