6.1

CVE-2021-0295: juniper networks junos os Incorrect Comparison

CVSS: 6.1v3.1MediumModified
Published 15-07-2021Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-0295 is a medium (CVSS 6.1) Incorrect Comparison vulnerability in juniper networks junos os. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.1% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-07-2021
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) of Juniper Networks Junos OS on the QFX10K Series switches allows an attacker to trigger a packet forwarding loop, leading to a partial Denial of Service (DoS). The issue is caused by DVMRP packets looping on a multi-homed Ethernet Segment Identifier (ESI) when VXLAN is configured. DVMRP packets received on a multi-homed ESI are sent to the peer, and then incorrectly forwarded out the same ESI, violating the split horizon rule. This issue only affects QFX10K Series switches, including the QFX10002, QFX10008, and QFX10016. Other products and platforms are unaffected by this vulnerability. This issue affects Juniper Networks Junos OS on QFX10K Series: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 version 18.2R1 and later versions; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S8; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S7, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.10%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

0.00 pp

From 1.10% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Juniper1 product
  • junos17.3 | 17.3:r1 | 17.3:r1-s1 | 17.3:r1-s4 | 17.3:r2 | 17.3:r2-s1 | 17.3:r2-s2 | 17.3:r2-s3 | 17.3:r2-s4 | 17.3:r2-s5 | 17.3:r3 | 17.3:r3-s1 | 17.3:r3-s10 | 17.3:r3-s11 | 17.3:r3-s2 | 17.3:r3-s3 | 17.3:r3-s4 | 17.3:r3-s5 | 17.3:r3-s6 | 17.3:r3-s7 | 17.3:r3-s8 | 17.3:r3-s9 | 17.4 | 17.4:r1 | 17.4:r1-s1 | 17.4:r1-s2 | 17.4:r1-s3 | 17.4:r1-s4 | 17.4:r1-s5 | 17.4:r1-s6 | 17.4:r1-s7 | 17.4:r2 | 17.4:r2-s1 | 17.4:r2-s10 | 17.4:r2-s11 | 17.4:r2-s12 | 17.4:r2-s2 | 17.4:r2-s3 | 17.4:r2-s4 | 17.4:r2-s5 | 17.4:r2-s6 | 17.4:r2-s7 | 17.4:r2-s8 | 17.4:r2-s9 | 17.4:r3 | 17.4:r3-s1 | 17.4:r3-s2 | 17.4:r3-s3 | 17.4:r3-s4 | 18.1 | 18.1:r1 | 18.1:r2 | 18.1:r2-s1 | 18.1:r2-s2 | 18.1:r2-s4 | 18.1:r3 | 18.1:r3-s1 | 18.1:r3-s10 | 18.1:r3-s11 | 18.1:r3-s12 | 18.1:r3-s2 | 18.1:r3-s3 | 18.1:r3-s4 | 18.1:r3-s5 | 18.1:r3-s6 | 18.1:r3-s7 | 18.1:r3-s8 | 18.1:r3-s9 | 18.2:r2 | 18.2:r2-s1 | 18.2:r2-s2 | 18.2:r2-s3 | 18.2:r2-s4 | 18.2:r2-s5 | 18.2:r2-s6 | 18.2:r2-s7 | 18.2:r3 | 18.2:r3-s1 | 18.2:r3-s2 | 18.2:r3-s3 | 18.2:r3-s4 | 18.2:r3-s5 | 18.2:r3-s6 | 18.2:r3-s7 | 18.3 | 18.3:r1 | 18.3:r1-s1 | 18.3:r1-s2 | 18.3:r1-s3 | 18.3:r1-s4 | 18.3:r1-s5 | 18.3:r1-s6 | 18.3:r2 | 18.3:r2-s1 | 18.3:r2-s2 | 18.3:r2-s3 | 18.3:r2-s4 | 18.3:r3 | 18.3:r3-s1 | 18.3:r3-s2 | 18.3:r3-s3 | 18.3:r3-s4 | 18.4 | 18.4:r1 | 18.4:r1-s1 | 18.4:r1-s2 | 18.4:r1-s3 | 18.4:r1-s4 | 18.4:r1-s5 | 18.4:r1-s6 | 18.4:r1-s7 | 18.4:r2 | 18.4:r2-s1 | 18.4:r2-s2 | 18.4:r2-s3 | 18.4:r2-s4 | 18.4:r2-s5 | 18.4:r2-s6 | 18.4:r2-s7 | 18.4:r2-s8 | 18.4:r3 | 18.4:r3-s1 | 18.4:r3-s2 | 18.4:r3-s3 | 18.4:r3-s4 | 18.4:r3-s5 | 18.4:r3-s6 | 18.4:r3-s7 | 19.1 | 19.1:r1 | 19.1:r1-s1 | 19.1:r1-s2 | 19.1:r1-s3 | 19.1:r1-s4 | 19.1:r1-s5 | 19.1:r1-s6 | 19.1:r2 | 19.1:r2-s1 | 19.1:r2-s2 | 19.1:r3 | 19.1:r3-s1 | 19.1:r3-s2 | 19.1:r3-s3 | 19.1:r3-s4 | 19.2 | 19.2:r1 | 19.2:r1-s1 | 19.2:r1-s2 | 19.2:r1-s3 | 19.2:r1-s4 | 19.2:r1-s5 | 19.2:r1-s6 | 19.2:r2 | 19.2:r2-s1 | 19.2:r3 | 19.2:r3-s1 | 19.3 | 19.3:r1 | 19.3:r1-s1 | 19.3:r2 | 19.3:r2-s1 | 19.3:r2-s2 | 19.3:r2-s3 | 19.3:r2-s4 | 19.3:r2-s5 | 19.3:r3 | 19.3:r3-s1 | 19.4:r1 | 19.4:r1-s1 | 19.4:r1-s2 | 19.4:r1-s3 | 19.4:r2 | 19.4:r2-s1 | 19.4:r2-s2 | 19.4:r2-s3 | 19.4:r3 | 19.4:r3-s1 | 19.4:r3-s2 | 20.1:r1 | 20.1:r1-s1 | 20.1:r1-s2 | 20.1:r1-s3 | 20.1:r1-s4 | 20.1:r2 | 20.1:r2-s1 | 20.2:r1 | 20.2:r1-s1 | 20.2:r1-s2 | 20.2:r1-s3 | 20.2:r2 | 20.2:r2-s1 | 20.2:r2-s2 | 20.2:r2-s3 | 20.3:r1 | 20.3:r1-s1 | 20.3:r2 | 20.3:r2-s1 | 20.4:r1 | 20.4:r1-s1
Juniper networks1 product
  • junos os≥ 17.3, < 17.3R3-S12 | ≥ 17.4, < 17.4R3-S5 | ≥ 18.1, < 18.1R3-S13 | ≥ 18.2R1, < 18.2* | ≥ 18.3, < 18.3R3-S5 | ≥ 18.4, < 18.4R2-S9, 18.4R3-S8 | ≥ 19.1, < 19.1R3-S5 | ≥ 19.2, < 19.2R1-S7, 19.2R3-S2 | ≥ 19.3, < 19.3R3-S2 | ≥ 19.4, < 19.4R3-S3 | ≥ 20.1, < 20.1R2-S2, 20.1R3 | ≥ 20.2, < 20.2R3 | ≥ 20.3, < 20.3R3 | ≥ 20.4, < 20.4R2

2 vendors · 2 products

References

1 links