CVE-2020-27540 json
Bash injection vulnerability and bypass of signature verification in Rostelecom CS-C2SHW 5.0.082.1.
published 2021-01-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20049
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- dil4rd.medium.com https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
dil4rd.medium.com
/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707
exploit, third-party-advisory
Sources
- CVE List CVE-2020-27540
- NVD CVE-2020-27540
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