CVE-2026-102484
Heap-based Buffer Overflow in ntpsec
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
Attack profile
How easy it is to exploit
- Attack vector
- Physical
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Heap-based Buffer Overflow in ntpsec
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
CVE-2026-102484- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2026-107310
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
EUVD-2026-107310- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pmw6-wmf7-r2cg
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an...
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
GHSA-pmw6-wmf7-r2cg- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
CVE-2026-102484- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
OSV
Heap-based Buffer Overflow in ntpsec
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
CVE-2026-102484- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-102484
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
DEBIAN-CVE-2026-102484- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-102484
Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
- Record
UBUNTU-CVE-2026-102484- CVSS 3.1
- 6.4 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12229-1 No score
libntpc1-1.2.6-1.1 on GA media
These are all security issues fixed in the libntpc1-1.2.6-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12229-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ntpsecDebian:12 |
All versions, plus listed versions 1.2.2+dfsg1-11.2.2+dfsg1-1+deb12u11.2.2+dfsg1-21.2.2+dfsg1-31.2.2+dfsg1-4 Show 10 moreShow less1.2.3+dfsg1-11.2.3+dfsg1-21.2.3+dfsg1-31.2.3+dfsg1-41.2.3+dfsg1-51.2.3+dfsg1-61.2.3+dfsg1-71.2.3+dfsg1-81.2.4+dfsg-11.2.5+dfsg-1 |
None known |
ntpsecDebian:13 |
All versions, plus listed versions 1.2.3+dfsg1-81.2.4+dfsg-11.2.5+dfsg-1 |
None known |
ntpsecDebian:14 |
All versions, plus listed versions 1.2.3+dfsg1-81.2.4+dfsg-11.2.5+dfsg-1 |
None known |
ntpsecUbuntu:18.04:LTS |
All versions, plus listed versions 1.0.0+dfsg1-11.0.0+dfsg1-31.1.0+dfsg1-11.1.0+dfsg1-1ubuntu0.11.1.0+dfsg1-1ubuntu0.2 |
None known |
ntpsecUbuntu:20.04:LTS |
All versions, plus listed versions 1.1.3+dfsg1-21.1.7+dfsg1-11.1.7+dfsg1-21.1.8+dfsg1-11.1.8+dfsg1-31.1.8+dfsg1-41.1.8+dfsg1-4build1 |
None known |
ntpsecUbuntu:22.04:LTS |
All versions, plus listed versions 1.2.0+dfsg1-41.2.1+dfsg1-21.2.1+dfsg1-31.2.1+dfsg1-3ubuntu11.2.1+dfsg1-4 |
None known |
ntpsecUbuntu:24.04:LTS |
All versions, plus listed versions 1.2.2+dfsg1-21.2.2+dfsg1-31.2.2+dfsg1-41.2.2+dfsg1-4build11.2.2+dfsg1-4build2 |
None known |
ntpsecUbuntu:26.10 |
All versions, plus listed versions 1.2.3+dfsg1-8ubuntu21.2.3+dfsg1-8ubuntu3 |
None known |
ntpsecUbuntu:26.04:LTS |
All versions, plus listed versions 1.2.3+dfsg1-8ubuntu11.2.3+dfsg1-8ubuntu2 |
None known |
ntpsecopenSUSE:Tumbleweed From an advisory covering 4 CVEs |
before 1.2.6-1.1 | 1.2.6-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-102484 is a medium vulnerability (CVSS 6.4) in Ntpsec, published October 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. No source names a fixed version.
References
gitlab.com/NTPsec/ntpsec/-/work_items/895
nvd.nist.gov/vuln/detail/CVE-2026-102484
github.com/advisories/GHSA-pmw6-wmf7-r2cg
Show 8 moreShow less
security-tracker.debian.org/tracker/CVE-2026-102484
ubuntu.com/security/CVE-2026-102484
cve.org/CVERecord?id=CVE-2026-102484
blog.ntpsec.org/2026/10/20/version-1.2.6.html
suse.com/security/cve/CVE-2026-102483