CVE-2009-1252

CVE-2009-1252 is a medium-severity vulnerability in Ntp with a CVSS 2.0 base score of 6.8. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Description

Stack-based buffer overflow in the crypto_recv function in ntp_crypto.c in ntpd in NTP before 4.2.4p7 and 4.2.5 before 4.2.5p74, when OpenSSL and autokey are enabled, allows remote attackers to execute arbitrary code via a crafted packet containing an extension field.

Frequently asked questions

What is CVE-2009-1252?
Stack-based buffer overflow in the crypto_recv function in ntp_crypto.c in ntpd in NTP before 4.2.4p7 and 4.2.5 before 4.2.5p74, when OpenSSL and autokey are enabled, allows remote attackers to execute arbitrary code via a crafted packet containing an extension field.
How severe is CVE-2009-1252?
CVE-2009-1252 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2009-1252 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1252?
CVE-2009-1252 primarily affects Ntp. In total, 78 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1252?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-1252 published?
CVE-2009-1252 was published on 2009-05-19 and last updated on 2026-06-16.

References

Affected products (78)

More vulnerabilities in Ntp

All CVEs affecting Ntp →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →