CVE-2026-21620— TFTP Path Traversal
Quick assessment
Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP存在安全漏洞，该漏洞源于tftp_file模块存在相对路径遍历和隔离不当问题，可能导致路径遍历攻击。
Possible ATT&CK Techniques 2 AI
T1030 · Data Transfer Size Limits T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-21620
Vulnerability Information
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Vulnerability Title
TFTP Path Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal. This vulnerability is associated with program files lib/tftp/src/tftp_file.erl, src/tftp_file.erl.
This issue affects OTP from OTP 17.0 before OTP 28.3.2, OTP 27.3.4.8 and OTP 26.2.5.17, corresponding to tftp from 1.0 before 1.2.4, 1.2.2.1 and 1.1.1.1; also inets from 5.10 before 7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP存在安全漏洞，该漏洞源于tftp_file模块存在相对路径遍历和隔离不当问题，可能导致路径遍历攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-21620
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-21620 (2)
IV. Related Vulnerabilities
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CVE-2026-65634
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eldap does not bound the port component of a referral URL be
Same vendor: Erlang
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CVE-2026-65634
Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT -
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SSH daemon allocates unbounded idle session channels, bypass -
CVE-2026-89422
TLS 1.3 client skips server authentication when ServerHello -
CVE-2026-69664
httpd parks a request worker indefinitely on a malformed chu -
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eldap does not bound the port component of a referral URL be
Same weakness: CWE-23
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V. Comments for CVE-2026-21620
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