SB2021021735 - Improperly implemented security check for standard in RPyC

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Main Vulnerability Database SB2021021735

SB2021021735 - Improperly implemented security check for standard in RPyC

Published: February 17, 2021 Updated: November 9, 2026

Security Bulletin ID SB2021021735
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improperly implemented security check for standard (CVE-ID: CVE-2019-16328) Exploited

CWE-ID: CWE-358 - Improperly Implemented Security Check for Standard

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows an authenticated, low-privileged remote attacker to execute arbitrary Python code by modifying exposed methods of a custom RPyC service.

The vulnerability exists due to a missing access check in RPyC's comparison request handler when processing crafted requests that access otherwise restricted object attributes. An authenticated, low-privileged remote attacker can replace an exposed service method with an evaluation function, leaving the modified behavior accessible through subsequent connections.


Remediation

Install update from vendor's website.

References