The version of OpenSSL installed on the remote host is prior to 3.0.20. It is, therefore, affected by multiple vulnerabilities as referenced in the 3.0.20 advisory.

  - Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap     buffer overflow on 32 bit platforms.  Impact summary: A heap buffer overflow may lead to a crash or     possibly an attacker controlled code execution or other undefined behavior.  If an attacker can supply a     crafted X.509 certificate with an excessively large OCTET STRING value in extensions such as the Subject     Key Identifier (SKID) or Authority Key Identifier (AKID) which are being converted to hex, the size of the     buffer needed for the result is calculated as multiplication of the input length by 3. On 32 bit     platforms, this multiplication may overflow resulting in the allocation of a smaller buffer and a heap     buffer overflow.  Applications and services that print or log contents of untrusted X.509 certificates are     vulnerable to this issue. As the certificates would have to have sizes of over 1 Gigabyte, printing or     logging such certificates is a fairly unlikely operation and only 32 bit platforms are affected, this     issue was assigned Low severity.  The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this     issue, as the affected code is outside the OpenSSL FIPS module boundary. Fixed in OpenSSL 3.3.7 (Affected     since 3.3.0). (CVE-2026-31789)

  - Issue summary: Applications using RSASVE key encapsulation to establish a secret encryption key can send     contents of an uninitialized memory buffer to a malicious peer.  Impact summary: The uninitialized buffer     might contain sensitive data from the previous execution of the application process which leads to     sensitive data leakage to an attacker.  RSA_public_encrypt() returns the number of bytes written on     success and -1 on error. The affected code tests only whether the return value is non-zero. As a result,     if RSA encryption fails, encapsulation can still return success to the caller, set the output lengths, and     leave the caller to use the contents of the ciphertext buffer as if a valid KEM ciphertext had been     produced.  If applications use EVP_PKEY_encapsulate() with RSA/RSASVE on an attacker-supplied invalid RSA     public key without first validating that key, then this may cause stale or uninitialized contents of the     caller-provided ciphertext buffer to be disclosed to the attacker in place of the KEM ciphertext.  As a     workaround calling EVP_PKEY_public_check() or EVP_PKEY_public_check_quick() before EVP_PKEY_encapsulate()     will mitigate the issue.  The FIPS modules in 3.6, 3.5, 3.4, 3.3, 3.1 and 3.0 are affected by this issue.
    Fixed in OpenSSL 3.3.7 (Affected since 3.3.0). (CVE-2026-31790)

  - Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a     NULL pointer dereference can happen.  Impact summary: Applications that process attacker-controlled CMS     data may crash before authentication or cryptographic operations occur resulting in Denial of Service.
    When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is     processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without     checking for its presence. This results in a NULL pointer dereference if the field is missing.
    Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based     protocols) are vulnerable.  The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,     as the affected code is outside the OpenSSL FIPS module boundary. Fixed in OpenSSL 3.3.7 (Affected since     3.3.0). (CVE-2026-28390)

  - Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL     pointer dereference can happen.  Impact summary: Applications that process attacker-controlled CMS data     may crash before authentication or cryptographic operations occur resulting in Denial of Service.  When a     CMS EnvelopedData message that uses KeyAgreeRecipientInfo is processed, the optional parameters field of     KeyEncryptionAlgorithmIdentifier is examined without checking for its presence. This results in a NULL     pointer dereference if the field is missing.  Applications and services that call CMS_decrypt() on     untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable.  The FIPS modules in 3.6,     3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS     module boundary. Fixed in OpenSSL 3.3.7 (Affected since 3.3.0). (CVE-2026-28389)

  - Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer     dereference might happen if the required CRL Number extension is missing.  Impact summary: A NULL pointer     dereference can trigger a crash which leads to a Denial of Service for an application.  When CRL     processing and delta CRL processing is enabled during X.509 certificate verification, the delta CRL     processing does not check whether the CRL Number extension is NULL before dereferencing it. When a     malformed delta CRL file is being processed, this parameter can be NULL, causing a NULL pointer     dereference.  Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in the     verification context, the certificate being verified to contain a freshestCRL extension or the base CRL to     have the EXFLAG_FRESHEST flag set, and an attacker to provide a malformed CRL to an application that     processes it.  The vulnerability is limited to Denial of Service and cannot be escalated to achieve code     execution or memory disclosure. For that reason the issue was assessed as Low severity according to our     Security Policy.  The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the     affected code is outside the OpenSSL FIPS module boundary. Fixed in OpenSSL 3.3.7 (Affected since 3.3.0).
    (CVE-2026-28388)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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OpenSSL 3.0.0 < 3.0.20 Multiple Vulnerabilities

critical Nessus Plugin ID 305202

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Version 1.3 Apr 28, 2026, 2:30 AM CVSS metrics ("CVSSv2 score" set to 10.0) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C") Plugin Feed: 202604280230
Version 1.2 Apr 10, 2026, 7:42 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202604101942
Version 1.1 Apr 8, 2026, 12:46 AM New Plugin Feed: 202604080046