Is CVE-2020-27540 actively exploited?

No active exploitation of CVE-2020-27540 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-27540 be exploited remotely?

Yes. CVE-2020-27540 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-27540?

CVE-2020-27540 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-27540

CRITICAL

CVE-2020-27540

CWE-347Published: January 26, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Bash injection vulnerability and bypass of signature verification in Rostelecom CS-C2SHW 5.0.082.1. The camera reads firmware update configuration from SD card file vc\version.json. fw-sign parameter and from this configuration is directly inserted into a bash command. Firmware update is run automatically if there is special file on the inserted SD card.

NVD Source

Technical Analysis

CVE-2020-27540 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.