CVE-2018-7182Ntp Memory Corruption
The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet with a ntpd instance from 4.2.8p6 through 4.2.8p10.
Published Mar 6, 2018 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2018-7182, UBUNTU-CVE-2018-7182, USN-3707-1
Key Facts
Patch immediately- CVE-2018-7182 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Element Software (Netapp), Ntp, Ubuntu Linux (Canonical) and 10 more products.
- It is not listed in any known-exploited vulnerabilities catalog. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 29% probability of exploitation in the next 30 days.
- Fixed versions are available, including libntpc1 1.2.1-1.2, Ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13, Ntp 1:4.2.8p10+dfsg-5ubuntu7.1.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
29%
Higher than 98.1% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
45/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2018-7182
- advisoryhttps://ubuntu.com/security/CVE-2018-7182
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2018-7182
- advisoryhttp://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html
- advisoryhttps://bugzilla.suse.com/1034892
- advisoryhttps://bugzilla.suse.com/1077445
Description
The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet with a ntpd instance from 4.2.8p6 through 4.2.8p10.
Affected Products
81 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Element SoftwareNetapp | See advisory | n/a |
| NtpNtp | 4.2.8-p10, 4.2.8-p6, 4.2.8-p7, 4.2.8-p8, 4.2.8-p9 | 4.2.8.p11-1 |
| Ubuntu LinuxCanonical | 17.10, 18.04 | n/a |
| ntpsecdebian | See advisory | 1.0.0+dfsg1-5 |
| ntpdateamazon | See advisory | 4.2.8p11-1.37.amzn1 |
Patched Releases
libntpc1
1.2.1-1.2
Ntp
1:4.2.6.p5+dfsg-3ubuntu2.14.04.13, 1:4.2.8p10+dfsg-5ubuntu7.1, 1:4.2.8p11+dfsg-1, 1:4.2.8p4+dfsg-3ubuntu5.9, 4.2.8.p11-1, 4.2.8p11-1.37.amzn1, 4.2.8p11-1.ph1, 4.2.8p11-31.3.1, 4.2.8p11-46.26.2, 4.2.8p11-64.3.2, 4.2.8p11-64.4.1, 4.2.8p11-64.5.1, 4.2.8p15-7.2
ntp-dcf77-tools
4.2.8p15-7.2
ntp-doc
4.2.8p11-1.37.amzn1, 4.2.8p11-31.3.1, 4.2.8p11-46.26.2, 4.2.8p11-64.3.2, 4.2.8p11-64.4.1, 4.2.8p11-64.5.1, 4.2.8p15-7.2
ntp-perl
4.2.8p11-1.37.amzn1
ntpdate
4.2.8p11-1.37.amzn1
ntpsec
1.0.0+dfsg1-5, 1.2.1-1.2
ntpsec-devel
1.2.1-1.2
ntpsec-doc
1.2.1-1.2
ntpsec-utils
1.2.1-1.2
python3-ntp
1.2.1-1.2
Timeline
Publicly disclosed
Mar 6, 2018
Last updated
Aug 4, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-125 Out-of-bounds Read
References
- advisorysecurity-tracker.debian.org · CVE-2018-7182
- advisoryubuntu.com · CVE-2018-7182
- advisorycve.org · CVERecord
- advisorypacketstormsecurity.com · Slackware-Security-Advisory-ntp-Updates.html
- advisorybugzilla.suse.com · 1034892
FAQ
Common Questions.
The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet with a ntpd instance from 4.2.8p6 through 4.2.8p10.
Affected: Element Software (Netapp); Ntp versions 4.2.8-p10, 4.2.8-p6, 4.2.8-p7, 4.2.8-p8, 4.2.8-p9; Ubuntu Linux (Canonical) versions 17.10, 18.04, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
A public exploit is reported by tracking sources, but no code link is listed yet.
Fixed versions are available, including libntpc1 1.2.1-1.2, Ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13, Ntp 1:4.2.8p10+dfsg-5ubuntu7.1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2018-7182 On Your Attack Surface?
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