CVE-2018-12391

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

During HTTP Live Stream playback on Firefox for Android, audio data can be accessed across origins in violation of security policies. Because the problem is in the underlying Android service, this issue is addressed by treating all HLS streams as cross-origin and opaque to access. *Note: this issue only affects Firefox for Android. Desktop versions of Firefox are unaffected.*. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
79.7%
KEV
Not listed

Published

February 28, 2019

Last Modified

November 21, 2024

References (16)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:13 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-02 16:54 UTCEPSS rescore
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  57. 2026-05-27 22:12 UTCEG score recompute
  58. 2026-05-27 22:12 UTCGHSA enrichment
  59. 2026-05-27 13:38 UTCEPSS rescore
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  63. 2026-05-26 07:17 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-12391?
CVE-2018-12391 is a high vulnerability published on February 28, 2019. During HTTP Live Stream playback on Firefox for Android, audio data can be accessed across origins in violation of security policies. Because the problem is in the underlying Android service, this issue is addressed by treating all HLS streams as cross-origin and opaque to access. Note: this issue…
When was CVE-2018-12391 disclosed?
CVE-2018-12391 was first published in the National Vulnerability Database on February 28, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-12391 actively exploited?
CVE-2018-12391 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-12391?
CVE-2018-12391 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-12391?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12391, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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