CVE-2026-121505 | BDVDB-2026-399997 Detail

NTPsecNTPsec

Description#

An out-of-bounds read in the NTS-KE client response parser (nts_client_process_response_core) in NTPsec before 1.2.4 allows a malicious NTS-KE server to read the client's stack memory, including pointers that defeat ASLR, which the client then sends in cleartext as NTS cookies, via an NTS-KE record whose declared length exceeds the data received.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-125 Out-of-bounds Read

References#

Exploit#

No public exploit known

History#

Version 12026-11-03Record published in the CVE List.

Published

Published: 2026-11-03
Last modified: 2026-11-03

Vendor information

Vendor: NTPsec
Product: NTPsec

All NTPsec vulnerabilities

Score

3.7 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 22.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 1.1.4 and < 1.2.4
Fixed
1.2.4

Scoring System

CVSS v4.0

Not available

CVSS v3.1

3.7 Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).