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    CVE-2015-5300

    The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).

    Published:Oct 21, 2015
    Last Modified:Apr 20, 2025
    EPS:Jul 21, 2017
    EPSS Score:0.31173
    CVSS Score:7.5

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Ntp
    Product
    Ntp
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Hpc Node
    Vendor
    Redhat
    Product
    Enterprise Linux Hpc Node Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation
    Vendor
    Suse
    Product
    Linux Enterprise Debuginfo
    Vendor
    Suse
    Product
    Linux Enterprise Desktop
    Vendor
    Suse
    Product
    Linux Enterprise Server
    Vendor
    Suse
    Product
    Linux Enterprise Software Development Kit
    Vendor
    Suse
    Product
    Manager
    Vendor
    Suse
    Product
    Manager Proxy
    Vendor
    Suse
    Product
    Openstack Cloud
    Vendor
    Suse
    Product
    Suse Linux Enterprise Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc
    http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
    http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html
    http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
    http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
    http://rhn.redhat.com/errata/RHSA-2015-1930.html
    http://seclists.org/bugtraq/2016/Feb/164
    http://support.ntp.org/bin/view/Main/NtpBug2956
    http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit
    http://www.debian.org/security/2015/dsa-3388
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.securityfocus.com/bid/77312
    http://www.securitytracker.com/id/1034670
    http://www.ubuntu.com/usn/USN-2783-1
    https://bto.bluecoat.com/security-advisory/sa113
    https://bugzilla.redhat.com/show_bug.cgi?id=1271076
    https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01
    https://security.netapp.com/advisory/ntap-20171004-0001/
    https://support.citrix.com/article/CTX220112
    https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885
    https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073
    https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264
    https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821
    https://www-01.ibm.com/support/docview.wss?uid=swg21979393
    https://www-01.ibm.com/support/docview.wss?uid=swg21980676
    https://www-01.ibm.com/support/docview.wss?uid=swg21983501
    https://www-01.ibm.com/support/docview.wss?uid=swg21983506
    https://www.cs.bu.edu/~goldbe/NTPattack.html
    https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc
    https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428
    https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
    https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc
    http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
    http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html
    http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
    http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
    http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
    http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
    http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
    http://rhn.redhat.com/errata/RHSA-2015-1930.html
    http://seclists.org/bugtraq/2016/Feb/164
    http://support.ntp.org/bin/view/Main/NtpBug2956
    http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit
    http://www.debian.org/security/2015/dsa-3388
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.securityfocus.com/bid/77312
    http://www.securitytracker.com/id/1034670
    http://www.ubuntu.com/usn/USN-2783-1
    https://bto.bluecoat.com/security-advisory/sa113
    https://bugzilla.redhat.com/show_bug.cgi?id=1271076
    https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01
    https://security.netapp.com/advisory/ntap-20171004-0001/
    https://support.citrix.com/article/CTX220112
    https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885
    https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073
    https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264
    https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821
    https://www-01.ibm.com/support/docview.wss?uid=swg21979393
    https://www-01.ibm.com/support/docview.wss?uid=swg21980676
    https://www-01.ibm.com/support/docview.wss?uid=swg21983501
    https://www-01.ibm.com/support/docview.wss?uid=swg21983506
    https://www.cs.bu.edu/~goldbe/NTPattack.html
    https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc
    https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428
    https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
    https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High