How severe is CVE-2020-27540?

CVE-2020-27540 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27540?

CVE-2020-27540 affects Company Cs-c2shw Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27540?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-27540 published?

CVE-2020-27540 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2020-27540

CVE-2020-27540 is a critical-severity vulnerability in Company Cs-c2shw Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Company Cs-c2shw Firmware
Published: 2021-01-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-27540?: 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.
How severe is CVE-2020-27540?: CVE-2020-27540 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27540?: CVE-2020-27540 affects Company Cs-c2shw Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-27540 published?: CVE-2020-27540 was published on 2021-01-26 and last updated on 2026-06-17.

References

https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707

Affected products (1)

cpe:2.3:o:company:cs-c2shw_firmware:5.0.082.1:*:*:*:*:*:*:*

More vulnerabilities in Company Cs-c2shw Firmware

CVE-2020-27539 — Critical (CVSS 9.8): Heap overflow with full parsing of HTTP respose in Rostelecom CS-C2SHW 5.0.082.1. AgentUpdater service has a…
CVE-2020-27541 — High (CVSS 7.5): Denial of Service vulnerability in Rostelecom CS-C2SHW 5.0.082.1. AgentGreen service has a bug in parsing broadcast…
CVE-2020-27542 — Medium (CVSS 6.8): Rostelecom CS-C2SHW 5.0.082.1 is affected by: Bash command injection. The camera reads configuration from QR code…

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