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Vulnerability record · CVE-2021-33576 · published 18 June 2021

CVE-2021-33576: Cleo lexicom path traversal vulnerability

Cleo · Lexicom

An issue was discovered in Cleo LexiCom 5.5.0.0. Within the AS2 message, the sender can specify a filename. This filename can include path-traversal characters, allowing the file to be written to an arbitrary location on disk.

9.8 CVSS 3.1 Critical EPSS 1.5% · top 25.9% CWE-22 · Path traversal
9.8CVSS 3.1 base score, v2 7.5
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Cleo LexiCom 5.5.0.0. Within the AS2 message, the sender can specify a filename. This filename can include path-traversal characters, allowing the file to be written to an arbitrary location on disk.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0011.md ExploitThird Party Advisory
https://www.cleo.com/cleo-lexicom Product
https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0011.md ExploitThird Party Advisory
https://www.cleo.com/cleo-lexicom Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-33576), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.