How severe is CVE-2012-6133?

CVE-2012-6133 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2012-6133?

CVE-2012-6133 affects the following packages: roundup (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2012-6133?

Update roundup to 1.4.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2012-6133 is resolved across your whole dependency graph.

How do I detect CVE-2012-6133 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for roundup, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2012-6133 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2012-6133 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2012-6133, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2012-6133?

CVE-2012-6133 has an EPSS (Exploit Prediction Scoring System) score of 1.6%, placing it in the 75th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2012-6133?

CVE-2012-6133 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2012-6133 published, and has it been updated?

CVE-2012-6133 was published on April 23, 2022 and was last updated on October 21, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍

🐍 PyPI

Not in CISA KEV

MEDIUM severity

CVE-2012-6133 — roundup

MEDIUM

CVE-2012-6133 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in roundup. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for roundup — see the affected versions and patch details below.

Multiple cross-site scripting (XSS) vulnerabilities in Roundup

Also known asPYSEC-2020-212

Published

Apr 23, 2022

Updated

Oct 21, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐍roundup

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Multiple cross-site scripting (XSS) vulnerabilities in Roundup before 1.4.20 allow remote attackers to inject arbitrary web script or HTML via the (1) @ok_message or (2) @error_message parameter to issue*.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`roundup`	all versions	1.4.20`pip install --upgrade 'roundup==1.4.20'`

Affected Products

1 product · 1 configurations

Application

rounduproundup-tracker

< 1.4.20

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Multiple cross-site scripting (XSS) vulnerabilities in Roundup before 1.…

pypi.python.orgNVDJan 2020

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for roundup, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update roundup to 1.4.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2012-6133 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2012-6133 in your dependencies?

Find it across PyPI, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

Timeline

First exploit

Jan 31, 2020

Disclosed

Apr 23, 2022

Last updated

Oct 21, 2024

Identifiers

CVE-2012-6133

PYSEC-2020-212

References

Advisorynvd.nist.gov · CVE 2012 6133 Advisorygithub.com · GHSA 5jq3 8437 x35p Webbugzilla.redhat.com · show bug.cgi Webgithub.com · PYSEC 2020 212.yaml Webpypi.python.org · 1.4.20 Webissues.roundup-tracker.org · issue2550724 Webopenwall.com Webopenwall.com Packagehg.code.sf.net · code

Related vulnerabilities

This CVE is medium severity, in line with the other 8 CVEs affecting roundup.

CVE-2025-53865CVE-2024-39124CVE-2024-39126CVE-2024-39125CVE-2012-6132CVE-2010-2491CVE-2012-6131CVE-2014-6276

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 21, 2024