Vulnerability Details : CVE-2017-3857

A vulnerability in the Layer 2 Tunneling Protocol (L2TP) parsing function of Cisco IOS (12.0 through 12.4 and 15.0 through 15.6) and Cisco IOS XE (3.1 through 3.18) could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient validation of L2TP packets. An attacker could exploit this vulnerability by sending a crafted L2TP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS or Cisco IOS XE Software if the L2TP feature is enabled for the device and the device is configured as an L2TP Version 2 (L2TPv2) or L2TP Version 3 (L2TPv3) endpoint. By default, the L2TP feature is not enabled. Cisco Bug IDs: CSCuy82078.
Published 2017-03-22 19:59:00
Updated 2020-07-27 16:59:49
Source Cisco Systems, Inc.
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2017-3857

EPSS FAQ
0.25%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-3857

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
 HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
 NIST

CWE ids for CVE-2017-3857

  • Assigned by: ykramarz@cisco.com (Secondary)
  • The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-3857

Products affected by CVE-2017-3857

  • Cisco » IOS
    Versions from including (>=) 12.0 and up to, including, (<=) 12.4
    cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
    Matching versions
  • Cisco » IOS
    Versions from including (>=) 15.0 and up to, including, (<=) 15.6
    cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
    Matching versions
  • Cisco » Ios Xe
    Versions from including (>=) 3.1.0 and up to, including, (<=) 3.18.0
    cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
    Matching versions
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