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CVE-2009-0021
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,…
Medium5.0EPSS 3.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
- EPSS (exploitation in 30 days)
- 3.2% · top 12% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Weakness
Affected products
n/a
- affected n/a
References (19)
- http://support.apple.com/kb/HT3549 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20090107 [oCERT-2008-016] Multiple OpenSSL signature verification API misuses (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 1021533 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- [announce] 20090108 NTP 4.2.4p6 Released (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 34642 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- RHSA-2009:0046 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 35074 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- APPLE-SA-2009-05-12 (opens in a new tab)vendor-advisoryx_refsource_APPLEx_transferred
- 33558 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- SUSE-SR:2009:005 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- http://www.ocert.org/advisories/ocert-2008-016.html (opens in a new tab)x_refsource_MISCx_transferred
- SSA:2009-014-03 (opens in a new tab)vendor-advisoryx_refsource_SLACKWAREx_transferred
- SUSE-SR:2009:008 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- 33648 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 33406 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- TA09-133A (opens in a new tab)third-party-advisoryx_refsource_CERTx_transferred
- oval:org.mitre.oval:def:10035 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- ADV-2009-1297 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- ADV-2009-0042 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2009-0021)Record last updated .