CVE-2021-37770
CVE-2021-37770 is a high-severity vulnerability in Nucleuscms Nucleus Cms with a CVSS 3.x base score of 7.2. 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-434.
Key facts
- Severity: High (CVSS 3.x base score 7.2)
- CVSS v2: 6.5
- EPSS exploit prediction: 1% (65th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-434
- Affected product: Nucleuscms Nucleus Cms
- Published:
- Last modified:
Description
Nucleus CMS v3.71 is affected by a file upload vulnerability. In this vulnerability, we can use upload to change the upload path to the path without the Htaccess file. Upload an Htaccess file and write it to AddType application / x-httpd-php.jpg. In this way, an attacker can upload a picture with shell, treat it as PHP, execute commands, so as to take down website resources.
Frequently asked questions
- What is CVE-2021-37770?
- Nucleus CMS v3.71 is affected by a file upload vulnerability. In this vulnerability, we can use upload to change the upload path to the path without the Htaccess file. Upload an Htaccess file and write it to AddType application / x-httpd-php.jpg. In this way, an attacker can upload a picture with shell, treat it as PHP, execute commands, so as to take down website resources.
- How severe is CVE-2021-37770?
- CVE-2021-37770 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-37770 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-37770?
- CVE-2021-37770 affects Nucleuscms Nucleus Cms. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-37770?
- 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-2021-37770 published?
- CVE-2021-37770 was published on 2022-06-30 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:nucleuscms:nucleus_cms:3.71:*:*:*:*:*:*:*
More vulnerabilities in Nucleuscms Nucleus Cms
- CVE-2018-16636 — Medium (CVSS 6.5): Nucleus CMS 3.70 allows HTML Injection via the index.php body parameter.
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- CVE-2015-5454 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in Nucleus CMS allows remote attackers to inject arbitrary web script or HTML…
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