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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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "erlang: Erlang OTP tftp_file modules: Information disclosure via relative path traversal",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21620.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-07-25T00:22:18Z",
"cve": "CVE-2026-21620",
"id": "CVE-2026-21620",
"initial_release_date": "2026-02-21T00:25:41Z",
"product_status:known_affected": "48",
"product_status:recommended": "94",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-21620",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-21620.json",
"version": "12"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-21620",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-20T13:36:03.423294Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-20T13:36:19.383Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://github.com",
"cpes": [
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"defaultStatus": "unaffected",
"modules": [
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],
"packageName": "erlang/otp",
"packageURL": "pkg:github/erlang/otp",
"product": "OTP",
"programFiles": [
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],
"repo": "https://github.com/erlang/otp",
"vendor": "Erlang",
"versions": [
{
"changes": [
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"at": "26.2.5.17",
"status": "unaffected"
},
{
"at": "27.3.4.8",
"status": "unaffected"
},
{
"at": "28.3.2",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "17.0",
"versionType": "otp"
},
{
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"status": "unaffected"
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{
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"status": "unaffected"
},
{
"at": "696fdec922661d4a3cc528fc34bc24fae8d4ad8a",
"status": "unaffected"
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],
"lessThan": "*",
"status": "affected",
"version": "07b8f441ca711f9812fad9e9115bab3c3aa92f79",
"versionType": "git"
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]
},
{
"defaultStatus": "unaffected",
"modules": [
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"packageName": "inets",
"packageURL": "pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
"product": "OTP",
"programFiles": [
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"repo": "https://github.com/erlang/otp",
"vendor": "Erlang",
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"status": "affected",
"version": "5.10",
"versionType": "otp"
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},
{
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"modules": [
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],
"packageName": "tftp",
"packageURL": "pkg:otp/tftp?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
"product": "OTP",
"programFiles": [
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],
"repo": "https://github.com/erlang/otp",
"vendor": "Erlang",
"versions": [
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"changes": [
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"at": "1.1.1.1",
"status": "unaffected"
},
{
"at": "1.2.2.1",
"status": "unaffected"
},
{
"at": "1.2.4",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "1.0",
"versionType": "otp"
}
]
}
],
"configurations": [
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"lang": "en",
"supportingMedia": [
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"base64": false,
"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."
}
],
"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."
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],
"cpeApplicability": [
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"nodes": [
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"cpeMatch": [
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"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"versionEndExcluding": "26.2.5.17",
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{
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"versionEndExcluding": "27.3.4.8",
"versionStartIncluding": "27.0",
"vulnerable": true
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{
"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
"versionEndExcluding": "28.3.2",
"versionStartIncluding": "28.0",
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"negate": false,
"operator": "OR"
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"operator": "AND"
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],
"credits": [
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"lang": "en",
"type": "finder",
"value": "Luigino Camastra / Aisle Research"
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{
"lang": "en",
"type": "remediation reviewer",
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{
"lang": "en",
"type": "remediation developer",
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],
"descriptions": [
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"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"
}
],
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}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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