Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2016-3953

28
FAUCET Score

CVE-2016-3953 describes a critical arbitrary code execution vulnerability in web2py before version 2.14.2, specifically within its sample web application. This flaw stems from the use of a hardcoded encryption key when calling the session.connect function. With a CVSS score of 9.8, this vulnerability is highly severe, allowing unauthenticated remote attackers to achieve full compromise (confidentiality, integrity, availability) with low attack complexity. Despite its critical nature, there is no evidence of active exploitation, public exploit code (Metasploit, ExploitDB, Nuclei), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.14.2CPE matchmatch criteria
cpe:2.3:a:web2py:web2py:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.31%
Probability of exploitation in next 30 days
EPSS Percentile
87.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0331 is in the 79th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa
Product: web2pyFixed in: 2.14.2

Vendor Advisories (1)

pipGHSA-q2rq-qgcf-m22wcritical

web2py remote code execution via hardcoded encryption key in session.connect function

May 14, 2022

References

devco.re / blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957
ExploitTechnical DescriptionThird Party Advisory
github.com / web2py/web2py/blob/R-2.14.1/applications/examples/models/session.py
Third Party Advisory
usn.ubuntu.com / 4030-1