How severe is CVE-2016-3954?

CVE-2016-3954 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-3954 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-3954?

CVE-2016-3954 affects Web2py. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-3954?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-3954 published?

CVE-2016-3954 was published on 2018-02-06 and last updated on 2026-06-17.

CVE-2016-3954

CVE-2016-3954 is a medium-severity vulnerability in Web2py with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Web2py
Published: 2018-02-06
Last modified: 2026-06-17

Description

web2py before 2.14.2 allows remote attackers to obtain the session_cookie_key value via a direct request to examples/simple_examples/status. NOTE: this issue can be leveraged by remote attackers to execute arbitrary code using CVE-2016-3957.

Frequently asked questions

What is CVE-2016-3954?: web2py before 2.14.2 allows remote attackers to obtain the session_cookie_key value via a direct request to examples/simple_examples/status. NOTE: this issue can be leveraged by remote attackers to execute arbitrary code using CVE-2016-3957.
How severe is CVE-2016-3954?: CVE-2016-3954 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-3954 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-3954?: CVE-2016-3954 affects Web2py. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-3954?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-3954 published?: CVE-2016-3954 was published on 2018-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:web2py:web2py:*:*:*:*:*:*:*:*

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