Is CVE-2020-27539 actively exploited?

No active exploitation of CVE-2020-27539 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-27539 be exploited remotely?

Yes. CVE-2020-27539 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-27539?

CVE-2020-27539 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-27539

CRITICAL

CVE-2020-27539

CWE-787Published: January 26, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-27539 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.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.