CVE-2021-41127Network attack vector

Arbitrary file write via unsafe tar extraction

Published Oct 21, 2021 · Updated Aug 4, 2024

Path traversal in Rasa before 2.8.10 allows remote authenticated users to overwrite bot files by uploading a crafted model archive. Model-loading code passes attacker-controlled tar member paths to extractall, allowing parent-directory sequences to escape the intended destination; the fix replaces those calls with TarSafe extraction. Exploitation requires access to supply an untrusted model through the CLI or an enabled API endpoint, and writes are bounded by the Rasa process's filesystem access.

CVSS severity7.3
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Rasa before 2.8.10 allows remote authenticated users to overwrite bot files by uploading a crafted model archive. Model-loading code passes attacker-controlled tar member paths to extractall, allowing parent-directory sequences to escape the intended destination; the fix replaces those calls with TarSafe extraction. Exploitation requires access to supply an untrusted model through the CLI or an enabled API endpoint, and writes are bounded by the Rasa process's filesystem access.

The record

CVE
CVE-2021-41127
Published
Oct 21, 2021
Updated
Aug 4, 2024
Vendor
Rasa
Product
Rasa
Classifications
CWE-23, CWE-22
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.8.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rasa · Rasaversion=< 2.8.10

Published CVSS scores

7.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
5.8NISTAV:N/AC:M/Au:N/C:N/I:P/A:P
7.1NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CWE-22Improper Limitation of a Pathname to a Restricted Directory

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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