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Fencer Vulns
high 7.8

CVE-2016-3952 json

web2py before 2.14.1, when using the standalone version, allows remote attackers to obtain environment variable values via a direct request…

published 2018-02-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-4964

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

web2py before 2.14.1, when using the standalone version, allows remote attackers to obtain environment variable values via a direct request to examples/template_examples/beautify. NOTE: this issue can be leveraged by remote attackers to gain administrative access.

Patch / fix

  • web2py web2py 2.14.1
  • web2py Ubuntu 16.04 LTS 2.12.3-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2016-3952

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • devco.re https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-255 Credentials Management Errors

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.