Root code execution or reload via stack overflow
Published Feb 4, 2021 · Updated Nov 8, 2024
Stack-based buffer overflow in Cisco Small Business RV router firmware allows remote authenticated users to execute root code or reload devices. The web-based management interface fails to validate attacker-controlled HTTP request data before copying it into a stack-based buffer. Valid administrator credentials are required; the interface is always reachable from the LAN and reaches the WAN only when remote management is enabled.
Summary
What happened
Stack-based buffer overflow in Cisco Small Business RV router firmware allows remote authenticated users to execute root code or reload devices. The web-based management interface fails to validate attacker-controlled HTTP request data before copying it into a stack-based buffer. Valid administrator credentials are required; the interface is always reachable from the LAN and reaches the WAN only when remote management is enabled.
The record
- CVE
- CVE-2021-1336
- Published
- Feb 4, 2021
- Updated
- Nov 8, 2024
- Vendor
- ClamAV
- Product
- Cisco Small Business RV Series Router Firmware
- Classifications
- CWE-121, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Feb 4, 2021CVE publishedPublication date reported by the CVE source.
- Nov 8, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=n/a
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo