CVE-2020-27542Public exploit

Shell command injection via unescaped static IP fields

Published Jan 25, 2021 · Updated Aug 4, 2024

OS command injection in Rostelecom CS-C2SHW 5.0.082.1 allows physically proximate attackers to inject Bash syntax through a QR code. The /etc/init.d/S99custom startup script reads attacker-controlled static IP fields from /config/ip-static and inserts them into Bash commands without escaping. The camera accepts the malicious configuration only before account linking succeeds, and successful QR configuration forces the reboot that reaches the vulnerable script.

CVSS severity6.8
Medium
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Rostelecom CS-C2SHW 5.0.082.1 allows physically proximate attackers to inject Bash syntax through a QR code. The /etc/init.d/S99custom startup script reads attacker-controlled static IP fields from /config/ip-static and inserts them into Bash commands without escaping. The camera accepts the malicious configuration only before account linking succeeds, and successful QR configuration forces the reboot that reaches the vulnerable script.

The record

CVE
CVE-2020-27542
Published
Jan 25, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
6.8NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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