Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | Typically causes application crash (denial of service). In some cases, may be exploitable for code execution on systems without memory protection. With a CVSS score of 6.2 (MEDIUM), this represents a moderate risk. |
| Exploit ScenarioDerived | An attacker provides input that causes a code path where a pointer is dereferenced without a prior NULL check, crashing the application. |
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Alert meAnalysisAIv1 – Mar 16, 2026
Transient DOS when importing a PKCS#8-encoded RSA private key with a zero-sized modulus.
Earlier versions of this analysis (1)
RemediationAI
Add NULL checks before pointer dereference operations. Use static analysis to identify potential NULL pointer issues. Enable compiler warnings.
Affected VersionsENISA
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
A NULL pointer dereference occurs when the application attempts to use a pointer that has not been initialized or has been set to NULL.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Executive ViewAI
CVE-2025-21433 presents moderate security risk, a null pointer dereference vulnerability rated CVSS 6.2. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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EUVD-2025-20490
NVD
CVE.org
EPSS
GitHub PoC
Exploit-DB