How severe is CVE-2020-18980?

CVE-2020-18980 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-2020-18980 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-18980?

CVE-2020-18980 affects Halo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-18980?

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-2020-18980 published?

CVE-2020-18980 was published on 2021-07-12 and last updated on 2026-06-17.

CVE-2020-18980

CVE-2020-18980 is a critical-severity vulnerability in Halo 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.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Halo
Published: 2021-07-12
Last modified: 2026-06-17

Description

Remote Code Executon vulnerability in Halo 0.4.3 via the remoteAddr and themeName parameters.

Frequently asked questions

What is CVE-2020-18980?: Remote Code Executon vulnerability in Halo 0.4.3 via the remoteAddr and themeName parameters.
How severe is CVE-2020-18980?: CVE-2020-18980 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-2020-18980 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-18980?: CVE-2020-18980 affects Halo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-18980?: 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-2020-18980 published?: CVE-2020-18980 was published on 2021-07-12 and last updated on 2026-06-17.

References

https://github.com/halo-dev/halo/issues/134

Affected products (1)

cpe:2.3:a:halo:halo:0.4.3:*:*:*:*:*:*:*

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-2020-21526 — 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…
CVE-2025-44594 — Critical (CVSS 9.1): halo v2.20.17 and before is vulnerable to server-side request forgery (SSRF) in…

All CVEs affecting Halo →