Description Preview
CVE-2021-3328 affects Aprelium Abyss Web Server X1 versions 2.12.1 and 2.14. The vulnerability allows remote attackers to crash the web server by sending specially crafted HTTP requests that cause an out-of-bounds read memory access. This vulnerability is classified as CWE-125 (Out-of-bounds Read) and can be exploited to cause a denial of service condition, making the web server unavailable to legitimate users.
Overview
Abyss Web Server X1 is a compact web server commonly used for hosting websites and web applications. The vulnerability exists in the HTTP request parsing mechanism of the server. When processing certain malformed HTTP requests, the server attempts to read memory outside the bounds of allocated buffers, resulting in a crash of the application. This vulnerability can be exploited remotely without authentication, making it a significant security risk for exposed servers. The out-of-bounds read occurs because the server fails to properly validate the boundaries of input data before processing it.
Remediation
To address this vulnerability, administrators should:
- Upgrade to a newer version of Abyss Web Server X1 that contains the security fix (versions released after the disclosure of this vulnerability).
- If upgrading is not immediately possible, implement network-level protections such as:
- Configure a web application firewall (WAF) to filter malicious HTTP requests
- Use a reverse proxy to sanitize incoming requests before they reach the vulnerable server
- Limit access to the web server to trusted IP addresses only
- Monitor server logs for potential exploitation attempts or unexpected crashes
- Consider implementing rate limiting to reduce the impact of potential denial of service attacks
References
- Original vulnerability disclosure and exploit details: https://jankopecky.net/index.php/2021/04/08/cve-2021-3328-abyss-web-server-remote-dos/
- CWE-125: Out-of-bounds Read: https://cwe.mitre.org/data/definitions/125.html
- MITRE CVE Entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3328
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- ManufacturingManufacturing
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- ConstructionConstruction
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Health Care & Social AssistanceHealth Care & Social Assistance
- InformationInformation
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- MiningMining
- Other Services (except Public Administration)Other Services (except Public Administration)
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Public AdministrationPublic Administration
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- Transportation & WarehousingTransportation & Warehousing
- UtilitiesUtilities
- Wholesale TradeWholesale Trade
