CVE-2020-6826Network attack vector

Arbitrary code execution via memory safety bugs

Published Apr 24, 2020 · Updated Aug 4, 2024

Memory safety vulnerability in Mozilla Firefox 74 allows remote attackers to execute arbitrary code via unspecified vectors. Mozilla reports memory-safety bugs with evidence of memory corruption but does not disclose a specific component, operation, or trigger. The advisory does not establish authentication, user interaction, or a safely reproducible runtime condition beyond exploitation of affected browser code.

CVSS severity9.8
Critical
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory safety vulnerability in Mozilla Firefox 74 allows remote attackers to execute arbitrary code via unspecified vectors. Mozilla reports memory-safety bugs with evidence of memory corruption but does not disclose a specific component, operation, or trigger. The advisory does not establish authentication, user interaction, or a safely reproducible runtime condition beyond exploitation of affected browser code.

The record

CVE
CVE-2020-6826
Published
Apr 24, 2020
Updated
Aug 4, 2024
Vendor
Mozilla
Product
Firefox
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 <75

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <75

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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