CVE-2026-21620 (GCVE-0-2026-21620)
Vulnerability from cvelistv5 – Published: 2026-02-20 10:57 – Updated: 2026-07-24 14:16
VLAI
EPSS
VEX
Title
TFTP Path Traversal
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-20 13:36 UTC
CWE
- CWE-23 - Relative Path Traversal
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-21620.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-21620 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/pull/10706 | patch |
| https://github.com/erlang/otp/commit/696fdec92266… | patch |
| https://github.com/erlang/otp/commit/3970738f6873… | patch |
| https://github.com/erlang/otp/commit/655fb95725ba… | patch |
Impacted products
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Relative Path Traversal\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"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\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"LOW\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/erlang/otp\", \"vendor\": \"Erlang\", \"modules\": [\"tftp_file\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"26.2.5.17\", \"status\": \"unaffected\"}, {\"at\": \"27.3.4.8\", \"status\": \"unaffected\"}, {\"at\": \"28.3.2\", \"status\": \"unaffected\"}], \"version\": \"17.0\", \"lessThan\": \"*\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"655fb95725ba2fb811740b57e106873833824344\", \"status\": \"unaffected\"}, {\"at\": \"3970738f687325138eb75f798054fa8960ac354e\", \"status\": \"unaffected\"}, {\"at\": \"696fdec922661d4a3cc528fc34bc24fae8d4ad8a\", \"status\": \"unaffected\"}], \"version\": \"07b8f441ca711f9812fad9e9115bab3c3aa92f79\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/erlang/otp\", \"packageName\": \"erlang/otp\", \"programFiles\": [\"lib/tftp/src/tftp_file.erl\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/erlang/otp\", \"vendor\": \"Erlang\", \"modules\": [\"tftp_file\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\", \"lessThan\": \"7.0\", \"versionType\": \"otp\"}], \"packageURL\": \"pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git\", \"packageName\": \"inets\", \"programFiles\": [\"src/tftp_file.erl\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/erlang/otp\", \"vendor\": \"Erlang\", \"modules\": [\"tftp_file\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"1.1.1.1\", \"status\": \"unaffected\"}, {\"at\": \"1.2.2.1\", \"status\": \"unaffected\"}, {\"at\": \"1.2.4\", \"status\": \"unaffected\"}], \"version\": \"1.0\", \"lessThan\": \"*\", \"versionType\": \"otp\"}], \"packageURL\": 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{\"url\": \"https://github.com/erlang/otp/commit/655fb95725ba2fb811740b57e106873833824344\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.5.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\\n\\nThis issue affects OTP from OTP 17.0 before OTP\\u00a028.3.2, OTP\\u00a027.3.4.8 and OTP\\u00a026.2.5.17, 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"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.\u003cp\u003e This vulnerability is associated with program files \u003ctt\u003elib/tftp/src/tftp_file.erl\u003c/tt\u003e, \u003ctt\u003esrc/tftp_file.erl\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects OTP from OTP 17.0 before OTP\u0026nbsp;28.3.2, OTP\u0026nbsp;27.3.4.8 and OTP\u0026nbsp;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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-23\", \"description\": \"CWE-23 Relative Path Traversal\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"A TFTP server must be started and the TFTP port must be reachable by the attacker, using the tftp application (or the legacy inets TFTP service) with the tftp_file callback module configured with the {root_dir, Dir} option.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"A TFTP server must be started and the TFTP port must be reachable by the attacker, using the \u003ctt\u003etftp\u003c/tt\u003e application (or the legacy \u003ctt\u003einets\u003c/tt\u003e TFTP service) with the \u003ctt\u003etftp_file\u003c/tt\u003e callback module configured with the \u003ctt\u003e{root_dir, Dir}\u003c/tt\u003e option.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"26.2.5.17\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.8\", \"versionStartIncluding\": \"27.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.3.2\", \"versionStartIncluding\": \"28.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-07-24T14:16:25.195Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-21620\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-24T14:16:25.195Z\", \"dateReserved\": \"2026-01-01T03:46:45.934Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-02-20T10:57:08.620Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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