CVE-2023-37271Network attack vector

Arbitrary code execution via stack-frame sandbox escape

Published Jul 11, 2023 · Updated Nov 7, 2024

Improper access control in Zope Foundation RestrictedPython before 5.3 and 6.0a1.dev0 through 6.0 allows attackers to execute Python code. The transformer permits generator attributes such as gi_frame and frame links such as f_back and f_builtins, enabling restricted code to traverse beyond its invocation boundary and recover unrestricted interpreter capabilities. Exposure requires an embedding application to accept untrusted restricted code, a non-default condition in the documented Zope and Plone integrations.

CVSS severity8.4
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper access control in Zope Foundation RestrictedPython before 5.3 and 6.0a1.dev0 through 6.0 allows attackers to execute Python code. The transformer permits generator attributes such as gi_frame and frame links such as f_back and f_builtins, enabling restricted code to traverse beyond its invocation boundary and recover unrestricted interpreter capabilities. Exposure requires an embedding application to accept untrusted restricted code, a non-default condition in the documented Zope and Plone integrations.

The record

CVE
CVE-2023-37271
Published
Jul 11, 2023
Updated
Nov 7, 2024
Vendor
Zope Foundation
Product
RestrictedPython
Classifications
CWE-913, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.3
  2. Affected versionversion=>= 6.0a1.dev0, < 6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zope Foundation · RestrictedPythonversion=< 5.3; version=>= 6.0a1.dev0, < 6.1

Published CVSS scores

8.4GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
9.9NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-913Improper Control of Dynamically-Managed Code Resources
T1059.006Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo