Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a crafted packet, rel
Noroxi assessment
Priority: Plan (action score 54/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 79% (FIRST EPSS); higher than 99.5% of all records.
- No special conditions are required; it is repeatable.
- Fixed version: ntp (Debian:11) 1:4.2.6.p5+dfsg-3.2; ntp (Debian:6.0) 1:4.2.6.p2+dfsg-1+deb6u1; ntp (Debian:7) 1:4.2.6.p5+dfsg-2+deb7u1.
Add it to your regular patch cycle. Upgrade to ntp (Debian:11) 1:4.2.6.p5+dfsg-3.2; ntp (Debian:6.0) 1:4.2.6.p2+dfsg-1+deb6u1; ntp (Debian:7) 1:4.2.6.p5+dfsg-2+deb7u1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a crafted packet, related to (1) the crypto_recv function when the Autokey Authentication feature is used, (2) the ctl_putdata function, and (3) the configure function.
- Published
- Dec 19, 2014
- Updated
- Jun 16, 2026
- EPSS
- 79.0% · 99th percentile
- CWE
- CWE-119
Report tools
Action score
54
Plan
Add it to your regular patch cycle.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 24 / 30 · 79.0%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| ntp | ntp | cpe:2.3:a:ntp:ntp |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ntp ntpup to 4.2.7 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:11 | ntp | before 1:4.2.6.p5+dfsg-3.2 | 1:4.2.6.p5+dfsg-3.2 |
| Debian:6.0 | ntp | before 1:4.2.6.p2+dfsg-1+deb6u1 | 1:4.2.6.p2+dfsg-1+deb6u1 |
| Debian:7 | ntp | before 1:4.2.6.p5+dfsg-2+deb7u1 | 1:4.2.6.p5+dfsg-2+deb7u1 |
| openSUSE:Tumbleweed | ntp | before 4.2.8p9-1.1 | 4.2.8p9-1.1 |
| Red Hat:enterprise_linux:5::client | ntp | before 0:4.2.2p1-18.el5_11 | 0:4.2.2p1-18.el5_11 |
| Red Hat:enterprise_linux:5::client | ntp-debuginfo | before 0:4.2.2p1-18.el5_11 | 0:4.2.2p1-18.el5_11 |
| Red Hat:enterprise_linux:6::client | ntp | before 0:4.2.6p5-2.el6_6 | 0:4.2.6p5-2.el6_6 |
| Red Hat:enterprise_linux:6::client | ntp-debuginfo | before 0:4.2.6p5-2.el6_6 | 0:4.2.6p5-2.el6_6 |
| Red Hat:enterprise_linux:6::client | ntp-doc | before 0:4.2.6p5-2.el6_6 | 0:4.2.6p5-2.el6_6 |
| Red Hat:enterprise_linux:6::client | ntp-perl | before 0:4.2.6p5-2.el6_6 | 0:4.2.6p5-2.el6_6 |
| Red Hat:enterprise_linux:6::client | ntpdate | before 0:4.2.6p5-2.el6_6 | 0:4.2.6p5-2.el6_6 |
| Red Hat:enterprise_linux:7::client | ntp | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:enterprise_linux:7::client | ntp-debuginfo | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:enterprise_linux:7::client | ntp-doc | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:enterprise_linux:7::client | ntp-perl | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:enterprise_linux:7::client | ntpdate | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:enterprise_linux:7::client | sntp | before 0:4.2.6p5-19.el7_0 | 0:4.2.6p5-19.el7_0 |
| Red Hat:rhel_eus:6.5::computenode | ntp | before 0:4.2.6p5-2.el6_5 | 0:4.2.6p5-2.el6_5 |
| Red Hat:rhel_eus:6.5::computenode | ntp-debuginfo | before 0:4.2.6p5-2.el6_5 | 0:4.2.6p5-2.el6_5 |
| Red Hat:rhel_eus:6.5::computenode | ntp-doc | before 0:4.2.6p5-2.el6_5 | 0:4.2.6p5-2.el6_5 |
| Red Hat:rhel_eus:6.5::computenode | ntp-perl | before 0:4.2.6p5-2.el6_5 | 0:4.2.6p5-2.el6_5 |
| Red Hat:rhel_eus:6.5::computenode | ntpdate | before 0:4.2.6p5-2.el6_5 | 0:4.2.6p5-2.el6_5 |
Same product
ntp: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-7871Crypto-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 authentication.64This week
- CVE-2013-5211The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplificat49Plan
- CVE-2018-12327Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher pri47Plan
Published before and after this one in the same product
- ← EarlierCVE-2014-9293Dec 19, 2014 · The config_auth function in ntpd in NTP before 4.2.7p11, when an auth key is not configured, improperly generates a key, which makes it easi34Monitor
- ← EarlierCVE-2014-9294Dec 19, 2014 · util/ntp-keygen.c in ntp-keygen in NTP before 4.2.7p230 uses a weak RNG seed, which makes it easier for remote attackers to defeat cryptogra34Monitor
- Later →CVE-2014-9296Dec 19, 2014 · The receive function in ntp_proto.c in ntpd in NTP before 4.2.8 continues to execute after detecting a certain authentication error, which m25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:ntp | 1:4.2.6.p5+dfsg-3.2 · Debian:11 | Package registry (OSV) |
| opensuse:ntp | 4.2.8p9-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:ntp | 0:4.2.6p5-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:ntp-debuginfo | 0:4.2.6p5-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:ntp-doc | 0:4.2.6p5-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:ntp-perl | 0:4.2.6p5-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:ntpdate | 0:4.2.6p5-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:sntp | 0:4.2.6p5-19.el7_0 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:5 | 2014-12-26 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+6 d
- TodayOct 21, 2026+4324 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- bugs.ntp.org/show_bug.cgi?id=2667
- bugs.ntp.org/show_bug.cgi?id=2668
- bugs.ntp.org/show_bug.cgi?id=2669
- lists.opensuse.org/opensuse-security-announce/2014-12/msg00020.html
- marc.info/?l=bugtraq&m=142469153211996&w=2
- marc.info/?l=bugtraq&m=142590659431171&w=2
- marc.info/?l=bugtraq&m=142853370924302&w=2
- marc.info/?l=bugtraq&m=144182594518755&w=2
- rhn.redhat.com/errata/RHSA-2014-2025.html
- rhn.redhat.com/errata/RHSA-2015-0104.html
- secunia.com/advisories/62209
- support.ntp.org/bin/view/Main/SecurityNotice
- www.kb.cert.org/vuls/id/852879
- www.mandriva.com/security/advisories?name=MDVSA-2015:003
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- www.securityfocus.com/bid/71761
- www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-417665.htm
- bugzilla.redhat.com/show_bug.cgi?id=1176037
- h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04790232
Vendor advisories and official records. Exploit/PoC links are deliberately left out.