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CVE-2021-3711 CRITICAL

CVE-2021-3711 exposure check for Openssl

Check whether public-facing assets expose Openssl Openssl signals related to CVE-2021-3711. Severity: CRITICAL.

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From CVE Record to External Exposure

In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the "out" parameter can be NULL and, on exit, the "outlen" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the "out" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attac...

Openssl vulnerability should be triaged by matching the affected vendor and product to live, internet-facing assets rather than treating the CVE as an abstract feed item. ThreatPort focuses on the first question that budget-constrained IT leaders and CISOs ask: what can an outside observer find today, how severe is it, and what should be fixed first?

Known Exploitation Record

Known ransomware campaign use
Not recorded
EPSS exploitation probability
87.82% (100p)
CVSS base score
9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Disclosed
2021-08-24
Weakness type
CWE-120

Source: CISA Known Exploited Vulnerabilities catalog and FIRST.org EPSS.

What ThreatPort Checks

Identify externally reachable services that appear related to Openssl Openssl.
Map detected technologies to CVE-2021-3711, severity context, and practical remediation priority.
Check TLS, DNS, headers, exposed panels, stale endpoints, and service fingerprints from a public attacker perspective.
Produce a concise scorecard first, then unlock deeper AI pentest evidence and PDF reporting when remediation planning begins.

The output is intentionally practical: ownership clues, risk context, remediation hints, and repeatable evidence that can be shared with technical teams or leadership. It is not positioned as magic compliance automation or a replacement for human security judgment.

Lean security teams rarely need another broad vulnerability list. They need to know whether an exposed endpoint, an expired certificate, a weak DNS setting, or a CVE-linked service is likely to affect the systems they actually run. ThreatPort scans from the outside in, ranks what it finds by real reachability rather than raw CVSS, and hands back evidence a team can act on the same day.

Route-Specific Evidence Profile

CVE-2021-3711 affects Openssl, a CWE-120 weakness. Disclosed 2021-08-24. This page exists to answer one question: is anything you own externally reachable and running it.

Assets This Page Should Care About

Public domains Subdomains Externally reachable web apps TLS endpoints DNS records

Signals Worth Prioritizing

Forgotten subdomains
Weak DNS or email controls
Outdated services
Risky headers

What Should Be Reviewed First in This Context?

For teams running Openssl, the first step is to validate internet-facing assets with business relevance instead of producing a generic vulnerability list.

Forgotten subdomains
Weak DNS or email controls
Outdated services
Risky headers

Action Checklist

  1. Confirm whether Openssl is present on any public domain, subdomain, API, or admin surface.
  2. Prioritize CRITICAL exposure only when the affected service is reachable or business-critical.
  3. Patch, disable, isolate, or put compensating controls in front of the affected service.
  4. Re-scan after remediation to capture before-and-after evidence for technical teams or leadership.

Context-Aware Next Fixes

  1. Verify ownership of exposed assets
  2. Close unnecessary public services
  3. Remediate the highest-confidence exposed findings first, then re-scan to prove closure.

Useful evidence for this context usually maps to ISO 27001, SOC 2, vendor security reviews. ThreatPort keeps the language cautious: this is operational security evidence, not a legal certification or a guarantee that every auditor will accept a generated report without review.