CVE-2009-1252

6.8 MEDIUM 21% exploit odds Fix listed Memory safety

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 21.3% chance of exploitation in the next 30 days (EPSS). Higher than most.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-05-19 19:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:06 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 21.3% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-05-19 19:30 UTC
Last modified: 2026-06-16 23:06 UTC
Exploit probability: 21.3% · EPSS, next 30 days
Weakness: CWE-119 · Buffer errors
Record status: Modified

Affected

Ntp 4.2.4p0
Ntp 4.2.4p1
Ntp 4.2.4p2
Ntp 4.2.4p3
Ntp 4.2.4p4
Ntp 4.2.4p5
Ntp 4.2.4p6
Ntp 4.2.5p0

Attack profile CVSS 2.0 · 6.8

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Partial
Integrity: Partial
Availability: Partial

Raw vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record