6.5

CVE-2021-0271: juniper networks junos os Double Free

CVSS: 6.5v3.1MediumModified
Published 22-04-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-0271 is a medium (CVSS 6.5) Double Free vulnerability in juniper networks junos os. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.2% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.40%
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. 22-04-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

A Double Free vulnerability in the software forwarding interface daemon (sfid) process of Juniper Networks Junos OS allows an adjacently-connected attacker to cause a Denial of Service (DoS) by sending a crafted ARP packet to the device. Continued receipt and processing of the crafted ARP packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX2200-C Series, EX3200 Series, EX3300 Series, EX4200 Series, EX4500 Series, EX4550 Series, EX6210 Series, EX8208 Series, EX8216 Series. 12.3 versions prior to 12.3R12-S17; 15.1 versions prior to 15.1R7-S8. This issue only affects the listed Marvell-chipset based EX Series devices. No other products or platforms are affected.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

0.00 pp

From 0.40% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.40%

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
  • junos12.3 | 12.3:r1 | 12.3:r10 | 12.3:r10-s1 | 12.3:r10-s2 | 12.3:r11 | 12.3:r12 | 12.3:r12-s1 | 12.3:r12-s10 | 12.3:r12-s11 | 12.3:r12-s12 | 12.3:r12-s13 | 12.3:r12-s14 | 12.3:r12-s15 | 12.3:r12-s16 | 12.3:r12-s3 | 12.3:r12-s4 | 12.3:r12-s6 | 12.3:r12-s8 | 15.1 | 15.1:a1 | 15.1:f | 15.1:f1 | 15.1:f2 | 15.1:f2-s1 | 15.1:f2-s2 | 15.1:f2-s3 | 15.1:f2-s4 | 15.1:f3 | 15.1:f4 | 15.1:f5 | 15.1:f5-s7 | 15.1:f6 | 15.1:f6-s1 | 15.1:f6-s10 | 15.1:f6-s12 | 15.1:f6-s2 | 15.1:f6-s3 | 15.1:f6-s4 | 15.1:f6-s5 | 15.1:f6-s6 | 15.1:f6-s7 | 15.1:f6-s8 | 15.1:f6-s9 | 15.1:f7 | 15.1:r | 15.1:r1 | 15.1:r2 | 15.1:r3 | 15.1:r4 | 15.1:r4-s7 | 15.1:r4-s8 | 15.1:r4-s9 | 15.1:r5 | 15.1:r5-s1 | 15.1:r5-s3 | 15.1:r5-s5 | 15.1:r5-s6 | 15.1:r6 | 15.1:r6-s1 | 15.1:r6-s2 | 15.1:r6-s3 | 15.1:r6-s4 | 15.1:r6-s6 | 15.1:r7 | 15.1:r7-s1 | 15.1:r7-s2 | 15.1:r7-s3 | 15.1:r7-s4 | 15.1:r7-s5 | 15.1:r7-s6 | 15.1:r7-s7
Juniper networks1 product
  • junos os≥ 12.3, < 12.3R12-S17 | ≥ 15.1, < 15.1R7-S8

2 vendors · 2 products

References

1 links