How severe is CVE-2011-2668?

CVE-2011-2668 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2011-2668 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2668?

CVE-2011-2668 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-2668?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-2668 published?

CVE-2011-2668 was published on 2020-01-21 and last updated on 2026-06-16.

CVE-2011-2668

CVE-2011-2668 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla Firefox
Published: 2020-01-21
Last modified: 2026-06-16

Description

Mozilla Firefox through 1.5.0.3 has a vulnerability in processing the content-length header

Frequently asked questions

What is CVE-2011-2668?: Mozilla Firefox through 1.5.0.3 has a vulnerability in processing the content-length header
How severe is CVE-2011-2668?: CVE-2011-2668 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2011-2668 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2668?: CVE-2011-2668 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-2668?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-2668 published?: CVE-2011-2668 was published on 2020-01-21 and last updated on 2026-06-16.

References

http://jvn.jp/en/jp/JVN36721438/index.html

Affected products (1)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

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