CVE-2021-4189
A remote, anonymous attacker can exploit multiple vulnerabilities in Python to conduct a denial of service attack and disclose information.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited by a remote anonymous attacker to conduct denial of service attacks and disclose information.
- Who is affected
- All deployments using affected versions of Python are at risk.
- Urgency
- Remediation is medium urgency as the vulnerabilities are not currently exploited but could lead to denial of service or information disclosure.
- Action
- Update Python to the latest version to mitigate these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Moderate exploitation risk3.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 87% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[UPDATE] [medium] Python: Multiple vulnerabilitiescert-bund · 2026-08-20
- high[NEW] [high] Oracle Solaris third-party components: Multiple vulnerabilitiescert-bund · 2026-08-11
- unknownUSN-8509-1: Python vulnerabilitiesubuntu · 2026-07-06
External references
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[](https://www.csirts.com/cve/CVE-2021-4189)