Junos OS: MX Series: MS-MPC/MIC might crash when processing malformed IPv6 packet in NAT64 configuration.

Description

On Juniper Networks MX Series with MS-MIC or MS-MPC card configured with NAT64 configuration, receipt of a malformed IPv6 packet may crash the MS-PIC component on MS-MIC or MS-MPC. This issue occurs when a multiservice card is translating the malformed IPv6 packet to IPv4 packet. An unauthenticated attacker can continuously send crafted IPv6 packets through the device causing repetitive MS-PIC process crashes, resulting in an extended Denial of Service condition. This issue affects Juniper Networks Junos OS on MX Series: 15.1 versions prior to 15.1R7-S7; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S6; 17.4 versions prior to 17.4R2-S11, 17.4R3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.2X75 versions prior to 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D65; 18.3 versions prior to 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R2-S5, 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2.

Scores

EPSS (exploitation in 30 days)

1.3% · top 29% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

• CWE-131 Incorrect Calculation of Buffer Size (opens in a new tab)All about CWE-131 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 15.1 – < 15.1R7-S7
  • affected 15.1X53 – < 15.1X53-D593
  • affected 16.1 – < 16.1R7-S8
  • affected 17.2 – < 17.2R3-S4
  • affected 17.3 – < 17.3R3-S6
  • affected 17.4 – < 17.4R2-S11, 17.4R3
  • affected 18.1 – < 18.1R3-S11
  • affected 18.2 – < 18.2R3-S6
  • affected 18.2X75 – < 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D65
  • affected 18.3 – < 18.3R2-S4, 18.3R3
  • affected 18.4 – < 18.4R2-S5, 18.4R3
  • affected 19.1 – < 19.1R2
  • affected 19.2 – < 19.2R1-S5, 19.2R2
  • affected 19.3 – < 19.3R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS 15.1R7-S7, 15.1X53-D593, 16.1R7-S8, 17.2R3-S4, 17.3R3-S6, 17.4R2-S11, 17.4R3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3, 18.4R2-S5, 18.4R3, 19.1R2, 19.2R1-S5, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.

Workaround: There are no viable workarounds for this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

• https://kb.juniper.net/JSA11077 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-1680](https://trackcve.app/badge/CVE-2020-1680.svg)](https://trackcve.app/cve/CVE-2020-1680)

Record last updated 17 Sept 2024, 00:55 UTC.