Buffer overflow in Company Cs-C2shw
CVE-2020-27539
Heap overflow with full parsing of HTTP respose in Rostelecom CS-C2SHW 5.0.082.1. AgentUpdater service has a self-written HTTP parser and builder. HTTP parser has a heap buffer overflow (OOB write). In default configuration camera parses responses only from HTTPS URLs from config file, so vulnerable code is unreachable and one more bug required to reach it.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.013 (68.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
- Company Cs-C2shw
- Company Cs-C2shw Firmware — versions 5.0.082.1
Weakness classification (CWE)
References
- dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27539?
- CVE-2020-27539 is a critical-severity vulnerability in Company Cs-C2shw, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-01-26.
- How severe is CVE-2020-27539?
- Critical severity. CVSS v3 base score is 9.8 out of 10.