CVE-2020-21527
CVE-2020-21527 is a high-severity vulnerability in Halo with a CVSS 3.x base score of 7.7. 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: High (CVSS 3.x base score 7.7)
- CVSS v2: 8.5
- EPSS exploit prediction: 1% (62nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Halo
- Published:
- Last modified:
Description
There is an Arbitrary file deletion vulnerability in halo v1.1.3. A backup function in the background allows a user, when deleting their backup files, to delete any files on the system through directory traversal.
Frequently asked questions
- What is CVE-2020-21527?
- There is an Arbitrary file deletion vulnerability in halo v1.1.3. A backup function in the background allows a user, when deleting their backup files, to delete any files on the system through directory traversal.
- How severe is CVE-2020-21527?
- CVE-2020-21527 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2020-21527 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-21527?
- CVE-2020-21527 affects Halo. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-21527?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-21527 published?
- CVE-2020-21527 was published on 2020-09-30 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:halo:halo:1.1.3:*:*:*:*:*:*:*
More vulnerabilities in Halo
- CVE-2022-32995 — Critical (CVSS 9.8): Halo CMS v1.5.3 was discovered to contain a Server-Side Request Forgery (SSRF) via the template remote download…
- CVE-2022-32994 — Critical (CVSS 9.8): Halo CMS v1.5.3 was discovered to contain an arbitrary file upload vulnerability via the component…
- CVE-2020-18980 — Critical (CVSS 9.8): Remote Code Executon vulnerability in Halo 0.4.3 via the remoteAddr and themeName parameters.
- CVE-2020-21526 — Critical (CVSS 9.8): An Arbitrary file writing vulnerability in halo v1.1.3. In an interface to write files in the background, a directory…
- CVE-2020-21523 — Critical (CVSS 9.8): A Server-Side Freemarker template injection vulnerability in halo CMS v1.1.3 In the Edit Theme File function. The ftl…
- CVE-2020-21522 — Critical (CVSS 9.8): An issue was discovered in halo V1.1.3. A Zip Slip Directory Traversal Vulnerability in the backend,the attacker can…
Other CWE-22 (Path Traversal) vulnerabilities
- CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
- CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
- CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
- CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
- CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
- CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…