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.

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

EPSS: 0.013 (66.6th percentile) — read the EPSS interpretation.

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.

Affected products

Company Cs-c2shw
Company Cs-c2shw_firmware — versions 5.0.082.1
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

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.