[UPDATE] [medium] Python: Multiple vulnerabilities
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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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2022-0011
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Elevated exploitation riskCVE-2021-373711.6% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2021-41893.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 87% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2021-3737 | coverage & exploitation status | NVD · CVE.org |
| CVE-2021-4189 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Python
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- medium[UPDATE] [medium] Python: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-09-04
- low[UPDATE] [low] Python (CPython Zipfile Module): Vulnerability allows file manipulationcert-bund · 2026-09-04
- medium[UPDATE] [medium] Python: Vulnerability allows Denial of Servicecert-bund · 2026-09-04
- medium[UPDATE] [medium] Python: Vulnerability allows code executioncert-bund · 2026-09-04
- medium[UPDATE] [medium] Python: Vulnerability allows code executioncert-bund · 2026-09-04
- low[UPDATE] [low] Python: Vulnerability allows path traversalcert-bund · 2026-09-04
More from CERT-Bund (BSI) Security Advisories
- medium[NEW] [medium] Langflow: Multiple vulnerabilities2026-09-04
- medium[NEW] [medium] Grafana Enterprise: Multiple vulnerabilities allow gaining user or administrator privileges2026-09-04
- low[NEW] [low] Checkmk: Vulnerability allows Denial of Service2026-09-04
- low[NEW] [low] ImageMagick: Multiple vulnerabilities allow Denial of Service2026-09-04
- critical[NEW] [critical] vm2: Multiple vulnerabilities allow code execution2026-09-04