What is CVE-2021-31379?

CVE-2021-31379 is a high-severity vulnerability in Juniper Junos, classified under CWE-696. CVSS score: 7.5/10. Published 2021-10-19.

How severe is CVE-2021-31379?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-31379 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Juniper Junos

CVE-2021-31379

An Incorrect Behavior Order vulnerability in the MAP-E automatic tunneling mechanism of Juniper Networks Junos OS allows an attacker to send certain malformed IPv4 or IPv6 packets to cause a Denial of Service (DoS) to the PFE on the device…

EPSS: 0.013 (67.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Junos — versions 17.2, 17.2x75, 17.3
Juniper Mx10
Juniper Mx10000
Juniper Mx10003
Juniper Mx10008
Juniper Mx10016
Juniper Mx104
Juniper Mx150
Juniper Mx2008
Juniper Mx2010

Weakness classification (CWE)

CWE-696

Public proof-of-concept exploits

References

sirt@juniper.net (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
sirt@juniper.net (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31379?: CVE-2021-31379 is a high-severity vulnerability in Juniper Junos, classified under CWE-696. CVSS score: 7.5/10. Published 2021-10-19.
How severe is CVE-2021-31379?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-31379 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.