CVE-2020-27539
CVE-2020-27539 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-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 1% (66th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Company Cs-c2shw Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-27539?
- 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.
- How severe is CVE-2020-27539?
- CVE-2020-27539 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-2020-27539 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-27539?
- CVE-2020-27539 affects Company Cs-c2shw Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-27539?
- 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-2020-27539 published?
- CVE-2020-27539 was published on 2021-01-26 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:company:cs-c2shw_firmware:5.0.082.1:*:*:*:*:*:*:*
More vulnerabilities in Company Cs-c2shw Firmware
- CVE-2020-27540 — Critical (CVSS 9.8): Bash injection vulnerability and bypass of signature verification in Rostelecom CS-C2SHW 5.0.082.1. The camera reads…
- 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…
All CVEs affecting Company Cs-c2shw Firmware →
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