What’s Vulnerable › Vulnerabilities

CVE-2016-3954

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-02-06 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• web2py: before 2.14.2 — fixed in 2.14.2

How to fix

Upgrade to a fixed version: web2py 2.14.2. Check the vendor advisory for mitigations.

References

• https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
• https://usn.ubuntu.com/4030-1/
• https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
• https://usn.ubuntu.com/4030-1/

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