CVE-2016-3953

CRITICALNVD 9.8

9.8

The sample web application in web2py before 2.14.2 might allow remote attackers to execute arbitrary code via vectors involving use of a hardcoded encryption key when calling the session.connect function.

CVSS v3: 9.8
EG Score: —
EPSS: 81.4%
KEV: Not listed

Published

February 6, 2018

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
cve@mitrehttps://github.com/web2py/web2py/blob/R-2.14.1/applications/examples/models/session.py
cve@mitrehttps://usn.ubuntu.com/4030-1/
af854a3a-2127-422b-91ae-364da2661108https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
af854a3a-2127-422b-91ae-364da2661108https://github.com/web2py/web2py/blob/R-2.14.1/applications/examples/models/session.py
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4030-1/

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
web2py	1.96.4, 1.98.2, 2.1.1	2.14.2	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-798Use of Hard-coded Credentials

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 15:35 UTCOSV refresh
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:43 UTCepss_batch

Frequently asked(5)

What is CVE-2016-3953?

CVE-2016-3953 is a critical vulnerability published on February 6, 2018. The sample web application in web2py before 2.14.2 might allow remote attackers to execute arbitrary code via vectors involving use of a hardcoded encryption key when calling the session.connect function.

When was CVE-2016-3953 disclosed?

CVE-2016-3953 was first published in the National Vulnerability Database on February 6, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-3953 actively exploited?

CVE-2016-3953 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2016-3953?

CVE-2016-3953 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2016-3953?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-3953, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2016-3953

Explore →

Is Your Infrastructure Affected by CVE-2016-3953?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs