CVE-2020-12471
CVE-2020-12471 is a critical-severity vulnerability in Mono Monox 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-502.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 3% (86th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-502
- Affected product: Mono Monox
- Published:
- Last modified:
Description
MonoX through 5.1.40.5152 allows remote code execution via HTML5Upload.ashx or Pages/SocialNetworking/lng/en-US/PhotoGallery.aspx because of deserialization in ModuleGallery.HTML5Upload, ModuleGallery.SilverLightUploadModule, HTML5Upload, and SilverLightUploadHandler.
Frequently asked questions
- What is CVE-2020-12471?
- MonoX through 5.1.40.5152 allows remote code execution via HTML5Upload.ashx or Pages/SocialNetworking/lng/en-US/PhotoGallery.aspx because of deserialization in ModuleGallery.HTML5Upload, ModuleGallery.SilverLightUploadModule, HTML5Upload, and SilverLightUploadHandler.
- How severe is CVE-2020-12471?
- CVE-2020-12471 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-2020-12471 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-12471?
- CVE-2020-12471 affects Mono Monox. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-12471?
- 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-2020-12471 published?
- CVE-2020-12471 was published on 2020-04-29 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:mono:monox:*:*:*:*:*:*:*:*
More vulnerabilities in Mono Monox
- CVE-2020-12470 — High (CVSS 7.2): MonoX through 5.1.40.5152 allows administrators to execute arbitrary code by modifying an ASPX template.
- CVE-2020-12473 — High (CVSS 7.2): MonoX through 5.1.40.5152 allows admins to execute arbitrary programs by reconfiguring the Converter Executable setting…
- CVE-2020-12472 — Medium (CVSS 5.4): MonoX through 5.1.40.5152 allows stored XSS via User Status, Blog Comments, or Blog Description.
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