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NVD / CVE Program· CNA mozilla

CVE-2020-12424: When constructing a permission prompt for WebRTC, a URI was supplied from the content process.

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 75.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: MozillaFirefox (openSUSE:Leap 15.1) 78.0.1-lp151.2.53.1; MozillaFirefox (openSUSE:Leap 15.2) 78.0.1-lp152.2.5.1; firefox (Red Hat:enterprise_linux:7::client) 0:78.3.0-1.el7_9.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to MozillaFirefox (openSUSE:Leap 15.1) 78.0.1-lp151.2.53.1; MozillaFirefox (openSUSE:Leap 15.2) 78.0.1-lp152.2.5.1; firefox (Red Hat:enterprise_linux:7::client) 0:78.3.0-1.el7_9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

When constructing a permission prompt for WebRTC, a URI was supplied from the content process. This URI was untrusted, and could have been the URI of an origin that was previously granted permission; bypassing the prompt. This vulnerability affects Firefox < 78.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Jul 9, 2020
Updated
Jun 16, 2026
EPSS
1.6% · 75th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
opensuseleap

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 78.0
  • opensuse leap15.1
  • opensuse leap15.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 78affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 15.1MozillaFirefoxbefore 78.0.1-lp151.2.53.178.0.1-lp151.2.53.1
openSUSE:Leap 15.2MozillaFirefoxbefore 78.0.1-lp152.2.5.178.0.1-lp152.2.5.1
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:78.3.0-1.el7_90:78.3.0-1.el7_9
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:78.3.0-1.el7_90:78.3.0-1.el7_9
Red Hat:enterprise_linux:8::appstreamfirefoxbefore 0:78.2.0-2.el8_20:78.2.0-2.el8_2
Red Hat:enterprise_linux:8::appstreamfirefox-debuginfobefore 0:78.2.0-2.el8_20:78.2.0-2.el8_2
Red Hat:enterprise_linux:8::appstreamfirefox-debugsourcebefore 0:78.2.0-2.el8_20:78.2.0-2.el8_2
Red Hat:rhel_e4s:8.0::appstreamfirefoxbefore 0:78.2.0-3.el8_00:78.2.0-3.el8_0
Red Hat:rhel_e4s:8.0::appstreamfirefox-debuginfobefore 0:78.2.0-3.el8_00:78.2.0-3.el8_0
Red Hat:rhel_e4s:8.0::appstreamfirefox-debugsourcebefore 0:78.2.0-3.el8_00:78.2.0-3.el8_0
Red Hat:rhel_eus:8.1::appstreamfirefoxbefore 0:78.2.0-3.el8_10:78.2.0-3.el8_1
Red Hat:rhel_eus:8.1::appstreamfirefox-debuginfobefore 0:78.2.0-3.el8_10:78.2.0-3.el8_1
Red Hat:rhel_eus:8.1::appstreamfirefox-debugsourcebefore 0:78.2.0-3.el8_10:78.2.0-3.el8_1
SUSE:HPE Helion OpenStack 8MozillaFirefoxbefore 78.0.1-112.3.178.0.1-112.3.1
SUSE:HPE Helion OpenStack 8MozillaFirefox-branding-SLEbefore 78-35.3.178-35.3.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP1MozillaFirefoxbefore 78.0.1-3.94.278.0.1-3.94.2
SUSE:Linux Enterprise Module for Desktop Applications 15 SP1MozillaFirefox-branding-SLEbefore 78-4.14.178-4.14.1
SUSE:Linux Enterprise Server 11 SP4-LTSSMozillaFirefoxbefore 78.0.1-78.80.278.0.1-78.80.2
SUSE:Linux Enterprise Server 11 SP4-LTSSMozillaFirefox-branding-SLEDbefore 78-21.12.178-21.12.1

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-6831May 26, 2020 · A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC.
    41Plan
  • ← EarlierCVE-2018-12371Jul 9, 2020 · An integer overflow vulnerability in the Skia library when allocating memory for edge builders on some systems with at least 16 GB of RAM.
    35Monitor
  • Later →CVE-2020-12399Jul 9, 2020 · NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys.
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:MozillaFirefox78.0.1-lp152.2.5.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:firefox0:78.2.0-3.el8_0 · Red Hat:rhel_e4s:8.0::appstreamPackage registry (OSV)
red hat:firefox-debuginfo0:78.2.0-3.el8_0 · Red Hat:rhel_e4s:8.0::appstreamPackage registry (OSV)
red hat:firefox-debugsource0:78.2.0-3.el8_0 · Red Hat:rhel_e4s:8.0::appstreamPackage registry (OSV)
suse:MozillaFirefox78.0.1-78.80.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
suse:MozillaFirefox-branding-SLE78-4.14.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP1Package registry (OSV)
suse:MozillaFirefox-branding-SLED78-21.12.1 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-276 · Incorrect Default Permissions

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records