CVE-2021-3712
7.4 · HIGHOverview
CVE-2021-3712 is a high-severity vulnerability affecting openssl openssl. It was published on August 24, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL's own "d2i" functions (and other similar parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array by directly setting the "data" and "length" fields in the ASN1_STRING array. This can also happen by using the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to assume that the ASN1_STRING byte array will be NUL termin
Remediation
Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| openssl | openssl | >= 1.0.2, < 1.0.2za | Affected |
| netapp | e-series_santricity_os_controller | 11.0 | Affected |
| mcafee | epolicy_orchestrator | >= 0, < 5.10.0 | Affected |
| tenable | nessus_network_monitor | >= 0, < 6.0.0 | Affected |
| tenable | tenable.sc | 5.16.0 | Affected |
| oracle | essbase | >= 0, < 11.1.2.4.047 | Affected |
| oracle | mysql_connectors | 0 | Affected |
| oracle | mysql_enterprise_monitor | 0 | Affected |
| oracle | mysql_server | 5.7.0 | Affected |
| oracle | mysql_workbench | 0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-3712?
CVE-2021-3712 is a high-severity vulnerability affecting openssl openssl. It was published on August 24, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).
How severe is CVE-2021-3712?
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-3712?
Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-3712?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-3712 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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