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CVE-2020-27539

CRITICALCVSS 9.8/10EPSS 1.26%

Last modified

CVE-2020-27539 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
1.26%

65.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CompanyCs-C2shw Firmware5.0.082.1

References

Timeline

Published
Last Modified
Status
Modified

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 score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27539?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27539?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST