CVE-2016-3953

Exp

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.

Published: 2018-02-06 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-3953 is rated High Exploit Risk (86.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.38%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.87% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2016-3953

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-3953

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.51% 3.38% +1.87%
2 2025-08-23 1.59% 1.51% -0.08%
3 2025-07-23 — 1.59% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-3953

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-3953

GitHub Security Advisory for CVE-2016-3953

GHSA-q2rq-qgcf-m22w · Severity: critical · Ecosystem: pip — web2py remote code execution via hardcoded encryption key in session.connect function

OS Trackers for CVE-2016-3953

vendor priority summary link
ubuntu low CVE-2016-3953 low priority: Ubuntu including 1 source packages (web2py), 7 status rows across 7 suites (artful, bionic, cosmic, disco, trusty, upstream, xenial): DNE 4, ignored 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2016-3953

Affected software / configurations for CVE-2016-3953

Vendor Product Version Raw CPE
web2py web2py < 2.14.2 cpe:2.3:a:web2py:web2py:*:*:*:*:*:*:*:*

References for CVE-2016-3953

cvelogic Threat Intelligence