Is CVE-2015-1798 in the CISA KEV catalog?

No. CVE-2015-1798 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-1798?

CVE-2015-1798 has a CVSS v2 base score of 1.8 (LOW).

What is the EPSS score for CVE-2015-1798?

CVE-2015-1798 has an EPSS score of 2.22% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-1798?

Upgrade ntp on debian 11 to 1:4.2.6.p5+dfsg-6 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-1798

LOWEPSS 81th pctl

1.8

CVSS v2

NVD

Description

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.

CWE-17

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.6.p5+dfsg-6CVE-2015-1798

ntpUbuntu

Fixed in:1:4.2.6.p5+dfsg-3ubuntu2.14.04.3USN-2567-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.22%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Vendor Advisory1

support.ntp.org

Third-Party Advisory1

kb.cert.org

Other references19

Related Vulnerabilities

Other CWE-17 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-0240	High	10.0	88%	-	Fix
CVE-2015-3183	Medium	5.0	73%	-	Fix
CVE-2014-9222	High	10.0	64%	-	-
CVE-2015-4620	High	7.8	38%	-	Fix
CVE-2014-9707	High	7.5	28%	-	-
CVE-2015-2526	Medium	5.0	24%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.