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CVE-2016-4921— Junos: IPv6 denial of service vulnerability due to resource exhaustion (CVE-2016-4921)

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件系统的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Junos OS中存在安全漏洞。攻击者可借助特制的IPv6流量利用该漏洞造成拒绝服务（可用资源耗尽和内核错误）。以下版本受到影响：Juniper Junos OS 11.4版本，12.3版本，12.3X48版本，13.3版本，14.1版本，14.1X53版本，14.1X55版本，14.2版本，15.1版本，15

AI Predicted 7.5 Difficulty: Moderate EPSS 2.91% · P87

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1298
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I. Basic Information for CVE-2016-4921

Vulnerability Information
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Vulnerability Title
Junos: IPv6 denial of service vulnerability due to resource exhaustion (CVE-2016-4921)
Source: CVE Program / CVE List V5
Vulnerability Description
By flooding a Juniper Networks router running Junos OS with specially crafted IPv6 traffic, all available resources can be consumed, leading to the inability to store next hop information for legitimate traffic. In extreme cases, the crafted IPv6 traffic may result in a total resource exhaustion and kernel panic. The issue is triggered by traffic destined to the router. Transit traffic does not trigger the vulnerability. This issue only affects devices with IPv6 enabled and configured. Devices not configured to process IPv6 traffic are unaffected by this vulnerability. This issue was found during internal product security testing. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. Affected releases are Juniper Networks Junos OS 11.4 prior to 11.4R13-S3; 12.3 prior to 12.3R3-S4; 12.3X48 prior to 12.3X48-D30; 13.3 prior to 13.3R10, 13.3R4-S11; 14.1 prior to 14.1R2-S8, 14.1R4-S12, 14.1R8; 14.1X53 prior to 14.1X53-D28, 14.1X53-D40; 14.1X55 prior to 14.1X55-D35; 14.2 prior to 14.2R3-S10, 14.2R4-S7, 14.2R6; 15.1 prior to 15.1F2-S5, 15.1F5-S2, 15.1F6, 15.1R3; 15.1X49 prior to 15.1X49-D40; 15.1X53 prior to 15.1X53-D57, 15.1X53-D70.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件系统的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Junos OS中存在安全漏洞。攻击者可借助特制的IPv6流量利用该漏洞造成拒绝服务（可用资源耗尽和内核错误）。以下版本受到影响：Juniper Junos OS 11.4版本，12.3版本，12.3X48版本，13.3版本，14.1版本，14.1X53版本，14.1X55版本，14.2版本，15.1版本，15
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 11.4 prior to 11.4R13-S3 -

II. Public POCs for CVE-2016-4921

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III. Intelligence Information for CVE-2016-4921

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Vendor Advisories for CVE-2016-4921 (3)

Same Patch Batch · Juniper Networks · 2017-10-13 · 25 CVEs total

CVE-2017-10616 5.3 MEDIUM Contrail: hard coded credentials
CVE-2017-10617 5.0 MEDIUM Contrail: XML External Entity (XXE) vulnerability
CVE-2017-10613 Junos OS: A kernel hang may occur due to a specific loopback filter action command
CVE-2017-10624 Junos Space: Insufficient verification of node certificates.
CVE-2017-10623 Junos Space: Insufficient verification of cluster messages
CVE-2017-10622 Junos Space: Authentication bypass vulnerability
CVE-2017-10621 Junos OS: Denial of service vulnerability in telnetd
CVE-2017-10620 SRX Series: Antivirus updates are downloaded without verification
CVE-2017-10619 Junos: SRX cluster denial of service vulnerability in flowd due to multicast packets
CVE-2017-10618 Junos: RPD core due to BGP UPDATE with malformed optional transitive attributes
CVE-2017-10615 Junos: Potential remote code execution vulnerability in PAM
CVE-2017-10614 Junos OS: A remote unauthenticated attacker can consume large amounts of CPU and/or memory
CVE-2016-1261 Junos: vulnerabilities in J-Web (CVE-2016-1261)
CVE-2017-10612 Junos Space: Persistent Cross site scripting in Junos Space
CVE-2017-10611 Junos: EX Series PFE and MX MPC7E/8E/9E PFE crash when fetching interface stats with 'exte
CVE-2017-10610 SRX Series: Embedded ICMP may cause the flowd process to crash
CVE-2017-10608 SRX series: Junos OS: SRX series using IPv6 Sun/MS-RPC ALGs may experience flowd crash on
CVE-2017-10607 Junos: rpd core due to receipt of specially crafted BGP packet
CVE-2017-10606 SRX Series: Cryptographic weakness in SRX300 Series TPM Firmware
CVE-2016-4925 JUNOSe: Line Card Reset: processor exception 0x68616c74 (halt) task: scheduler, upon recei

Showing top 20 of 25 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks

V. Comments for CVE-2016-4921

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