Vulnerability Monitor

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CVE-2015-1799

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.

Published

2015-04-08T10:59:05.717

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 4.3 (MEDIUM)

CVSSv2 Vector

AV:A/AC:M/Au:N/C:N/I:P/A:P

  • Access Vector: ADJACENT_NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

5.5

Impact Score

4.9

Weaknesses
  • Type: Primary
    CWE-17
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application ntp ntp ≤ 4.2.7p444 Yes
References