CVE-2020-15025

CVE-2020-15025 is a medium-severity vulnerability in Ntp with a CVSS 3.x base score of 4.4. 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-401.

Key facts

• Severity: Medium (CVSS 3.x base score 4.4)
• CVSS v2: 4.0
• EPSS exploit prediction: 3% (87th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-401
• Affected product: Ntp
• Published: 2020-06-24
• Last modified: 2026-06-17

Description

ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of service (memory consumption) by sending packets, because memory is not freed in situations where a CMAC key is used and associated with a CMAC algorithm in the ntp.keys file.

Frequently asked questions

What is CVE-2020-15025?

ntpd in ntp 4.2.8 before 4.2.8p15 and 4.3.x before 4.3.101 allows remote attackers to cause a denial of service (memory consumption) by sending packets, because memory is not freed in situations where a CMAC key is used and associated with a CMAC algorithm in the ntp.keys file.

How severe is CVE-2020-15025?

CVE-2020-15025 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-15025 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15025?

CVE-2020-15025 primarily affects Ntp. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-15025?

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

When was CVE-2020-15025 published?

CVE-2020-15025 was published on 2020-06-24 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html
• https://bugs.gentoo.org/729458
• https://security.gentoo.org/glsa/202007-12
• https://security.netapp.com/advisory/ntap-20200702-0002/
• https://support.ntp.org/bin/view/Main/NtpBug3661
• https://support.ntp.org/bin/view/Main/SecurityNotice#June_2020_ntp_4_2_8p15_NTP_Relea
• https://www.oracle.com/security-alerts/cpujan2021.html

Affected products (21)

• cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.2.8:p11:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.2.8:p12:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.2.8:p13:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.2.8:p14:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:8300_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:8700_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:a400_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*

More vulnerabilities in Ntp

• CVE-2018-12327 — Critical (CVSS 9.8): Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or…
• CVE-2018-7183 — Critical (CVSS 9.8): Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute…
• CVE-2015-7871 — Critical (CVSS 9.8): Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass…
• CVE-2015-7853 — Critical (CVSS 9.8): The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote…
• CVE-2015-7705 — Critical (CVSS 9.8): The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified…
• CVE-2015-7854 — High (CVSS 8.8): Buffer overflow in the password management functionality in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows…

All CVEs affecting Ntp →

Other CWE-401 (Missing Release of Memory after Effective Lifetime) vulnerabilities

• CVE-2022-0742 — Critical (CVSS 9.1): Memory leak in icmp6 implementation in Linux Kernel 5.13+ allows a remote attacker to DoS a host by making it go…
• CVE-2024-25450 — High (CVSS 8.8): imlib2 v1.9.1 was discovered to mishandle memory allocation in the function init_imlib_fonts().
• CVE-2023-33718 — High (CVSS 8.8): mp4v2 v2.1.3 was discovered to contain a memory leak via MP4File::ReadString() at mp4file_io.cpp
• CVE-2021-40633 — High (CVSS 8.8): A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of…
• CVE-2021-3492 — High (CVSS 8.8): Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring…
• CVE-2019-17340 — High (CVSS 8.8): An issue was discovered in Xen through 4.11.x allowing x86 guest OS users to cause a denial of service or gain…

Browse all CWE-401 (Missing Release of Memory after Effective Lifetime) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 197.248.207.139 (ipv4-addr)
• 135.129.128.247 (ipv4-addr)
• 119.201.59.224 (ipv4-addr)
• 125.212.244.35 (ipv4-addr)
• 202.29.220.126 (ipv4-addr)
• 93.42.227.251 (ipv4-addr)
• 82.209.191.11 (ipv4-addr)
• 119.204.60.250 (ipv4-addr)