How severe is CVE-2015-1799?

CVE-2015-1799 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-1799 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-1799?

CVE-2015-1799 affects Ntp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-1799?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-1799 published?

CVE-2015-1799 was published on 2015-04-08 and last updated on 2026-06-17.

CVE-2015-1799

CVE-2015-1799 is a medium-severity vulnerability in Ntp with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-17.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-17
Affected product: Ntp
Published: 2015-04-08
Last modified: 2026-06-17

Description

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.

Frequently asked questions

What is CVE-2015-1799?: The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.
How severe is CVE-2015-1799?: CVE-2015-1799 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-1799 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-1799?: CVE-2015-1799 affects Ntp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-1799?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-1799 published?: CVE-2015-1799 was published on 2015-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

42.200.60.186 (ipv4-addr)
223.197.153.135 (ipv4-addr)