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October 14, 2026

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CVE-2021-3177NVD

Vulnerability Summary

Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Python applications that accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used unsafely.
Severity Level
CRITICAL(9.8)
Published Date
Jan 19, 2021
Last Modified
Oct 14, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
23.29%Probability
Root Weakness (CWE)
CWE-120: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Python Python >= 3.6.0 and <= 3.6.12
  • Python Python >= 3.7.0 and <= 3.7.9
  • Python Python >= 3.8.0 and <= 3.8.7
  • Python Python >= 3.9.0 and <= 3.9.1
  • Fedoraproject Fedora
  • Netapp Active Iq Unified Manager
  • Netapp Ontap Select Deploy Administration Utility
  • Debian Debian Linux
  • Oracle Communications Cloud Native Core Network Function Cloud Native Environment
  • Oracle Communications Offline Mediation Controller
  • Oracle Communications Pricing Design Center
  • Oracle Enterprise Manager Ops Center
  • Oracle Zfs Storage Appliance Kit
Patched Versions
Not provided by NVD for this CVE.
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References