CVE-2021-33576
CVE-2021-33576 is a critical-severity vulnerability in Cleo Lexicom with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Cleo Lexicom
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-33576?
- 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.
- How severe is CVE-2021-33576?
- CVE-2021-33576 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-33576 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-33576?
- CVE-2021-33576 affects Cleo Lexicom. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-33576?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-33576 published?
- CVE-2021-33576 was published on 2021-06-18 and last updated on 2026-06-17.
References
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0011.md
- https://www.cleo.com/cleo-lexicom
Affected products (1)
- cpe:2.3:a:cleo:lexicom:5.5.0.0:*:*:*:*:*:*:*
More vulnerabilities in Cleo Lexicom
- CVE-2024-55956 — Critical (CVSS 9.8): In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can…
- CVE-2024-50623 — Critical (CVSS 9.8): In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file…
- CVE-2021-33577 — Medium (CVSS 5.3): An issue was discovered in Cleo LexiCom 5.5.0.0. The requirement for the sender of an AS2 message to identify…
All CVEs affecting Cleo Lexicom →
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