CVE-2026-21620 is classified as a low severity vulnerability affecting the Erlang OTP. This vulnerability allows relative path traversal due to improper isolation or compartmentalization within the TFTP file modules. The CVSS score for this vulnerability is 2.3, indicating a low level of risk to systems. The vulnerability poses a threat to organizations using affected versions of Erlang, as it could potentially lead to unauthorized access to files.
Risk to organizations includes exposure to data that may be accessed through relative path traversals. With the nature of this vulnerability, there is a need for organizations to understand the implications and address this issue. The vulnerability was published on February 20, 2026, and has been categorized with a CWE-23 classification, indicating improper access control.
Currently, there are no known exploits for this vulnerability, and it has not been classified as actively exploited in the wild. However, organizations should prioritize patching as part of their security measures to prevent potential future risks.
Organizations should address this vulnerability in their patch management cycle to ensure the security of their systems.
Vulnerability Details
The vulnerability specifically affects the TFTP file modules within Erlang OTP, including the modules found in the program files lib/tftp/src/tftp_file.erl and src/tftp_file.erl. The issue impacts versions of OTP from 17.0 onwards, including specific commits that have contributed to the vulnerability.
Organizations should refer to the official documentation for detailed version information and ensure they are running patched versions to mitigate the vulnerability.
Technical Analysis
The root cause of CVE-2026-21620 lies in the improper handling of file paths within the TFTP module, allowing attackers to traverse directories and access unauthorized files. The attack vector is network-based, meaning that it can be exploited remotely without the need for physical access to the system. The complexity of the attack is low, requiring minimal technical skill to exploit.
The vulnerability requires low privileges to exploit, meaning that an attacker does not need administrative access to initiate an attack. User interaction is not required, making it easier for potential attackers to exploit this vulnerability. The confidentiality and integrity impacts are both rated as low, indicating that while sensitive data might be at risk, the overall impact is limited.
Risk & Impact Analysis
Real-world deployment risks associated with CVE-2026-21620 include unauthorized access to sensitive files, which can lead to data leaks or other security incidents. While the CVSS score of 2.3 indicates a low severity, organizations should still consider the potential for exploitation, especially if the affected systems contain critical data.
The urgency assessment for this vulnerability is categorized as low. Organizations may address remediation during routine maintenance but should not overlook the potential risks associated with leaving this vulnerability unpatched.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects multiple versions of Erlang OTP, specifically from version 17.0 onwards and from version 5.10 before 7.0. Organizations should refer to the vendor's documentation for detailed version information and ensure that they are running patched versions.
Mitigation & Remediation
Organizations should prioritize patching this vulnerability as soon as updates are available. If a patch is not yet available, organizations should consider implementing workarounds, such as restricting access to affected modules or monitoring for irregular access patterns.
For further security measures, organizations may want to conduct regular security assessments and consider utilizing penetration testing to identify and remediate weaknesses.
Detection Guidance
Organizations should monitor logs for any unusual access patterns that may indicate attempts to exploit this vulnerability. Specific indicators to look for include unexpected file access requests and anomalies in user behavior related to the TFTP service.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-21620 lies in the potential for similar vulnerabilities to emerge within TFTP implementations. Security teams should remain vigilant and prioritize continuous monitoring and assessment of their systems to identify potential weaknesses.
Organizations should take this opportunity to review their security posture and ensure that they are equipped to handle vulnerabilities as they arise. For more information on improving your security measures, refer to our vulnerability management program and consider implementing a rigorous security assessment strategy.
Finally, leveraging insights from industry trends can help organizations anticipate and prepare for potential threats. For a comprehensive overview, check out our guide on penetration testing methodology to enhance your security strategy.
By adopting a proactive approach to security and vulnerability management, organizations can significantly reduce their risk exposure.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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