Vulnerability in Rencode Project
CVE-2021-40839
The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.055 (92.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.056 · newest: 0.055 · change: -0.000
Affected products
- Rencode Project
- Fedoraproject Fedora — versions 34, 35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/aresch/rencode/pull/29 (Patch, Third Party Advisory)
- seclists.org/fulldisclosure/2021/Sep/16 (Mailing List, Third Party Advisory)
- github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75 (Patch, Third Party Advisory)
- pypi.org/project/rencode/ (Third Party Advisory)
- security.netapp.com/advisory/ntap-20211008-0001/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2021-40839?
- CVE-2021-40839 is a high-severity vulnerability in Rencode Project, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2021-09-10.
- How severe is CVE-2021-40839?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-40839 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.