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Fencer Vulns
high 8.1

CVE-2020-28468 json

Improper Control of Generation of Code ('Code Injection')

published 2021-01-08 5 y ago modified 2026-06-17 4 mo ago also GHSA-7xc5-ggpp-g249 , PYSEC-2021-72 , EUVD-2021-0204

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

This affects the package pwntools before 4.3.1. The shellcraft generator for affected versions of this module are vulnerable to Server-Side Template Injection (SSTI), which can lead to remote code execution.

Patch / fix

  • pypi pwntools 4.3.1
  • n/a pwntools 4.3.1
  • python-pwntools Arch Linux 4.3.1-1

arch linux advisories AVG-1419

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-28468 updated cvss 8.1

pwntools: shellcraft generator is vulnerable to Server-Side Template Injection, which can lead to remote code execution

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.38% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-PYTHON-PWNTOOLS-1047345 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/Gallopsled/pwntools/issues/1427 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi pwntools
<4.3.1
4.3.1

Affected products

  • n/a pwntools

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.