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CVE-2020-27539

CRITICAL
9.8
CVSS Score
Published: January 25, 2021 at 08:26 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
2 products affected across 1 vendorCs C2SHW FirmwareCs-C2Shw

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Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cs C2SHW Firmware· Company
95%
5.0.082.1
company-cs-c2shw (same device)
Cs-C2Shw· Companydevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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