FKIE_CVE-2009-0021
Vulnerability from fkie_nvd - Published: 2009-01-07 17:30 - Updated: 2026-06-16 23:04
Severity
Summary
NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.
References
{
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"descriptions": [
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"value": "NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077."
},
{
"lang": "es",
"value": "NTP versiones 4.2.4 anteriores a 4.2.4p5 y versiones 4.2.5 anteriores a 4.2.5p150, no comprueba apropiadamente el valor devuelto de la funci\u00f3n EVP_VerifyFinal de OpenSSL, que permite a los atacantes remotos omitir la comprobaci\u00f3n de la cadena de certificados por medio de una firma de SSL/TLS malformada para las claves DSA y ECDSA, una vulnerabilidad similar a CVE-2008-5077."
}
],
"evaluatorComment": "Note that versions 4.2.5 before 4.2.5p150 are development versions and not production versions. Development versions are not included in the CPE configuration for CVEs.",
"id": "CVE-2009-0021",
"lastModified": "2026-06-16T23:04:05.973",
"metrics": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
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"impactScore": 2.9,
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"published": "2009-01-07T17:30:00.360",
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"url": "https://lists.ntp.org/pipermail/announce/2009-January/000055.html"
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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