7.5

CVE-2020-1638: juniper networks junos os Use of sizeof() on a Pointer Type

CVSS: 7.5v3.1HighModified
Published 08-04-2020Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2020-1638 is a high (CVSS 7.5) Use of sizeof() on a Pointer Type vulnerability in juniper networks junos os. EPSS estimates a 1.32% chance of exploitation in the next 30 days, higher than 70.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.32%
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. 08-04-2020
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

The FPC (Flexible PIC Concentrator) of Juniper Networks Junos OS and Junos OS Evolved may restart after processing a specific IPv4 packet. Only packets destined to the device itself, successfully reaching the RE through existing edge and control plane filtering, will be able to cause the FPC restart. When this issue occurs, all traffic via the FPC will be dropped. By continuously sending this specific IPv4 packet, an attacker can repeatedly crash the FPC, causing an extended Denial of Service (DoS) condition. This issue can only occur when processing a specific IPv4 packet. IPv6 packets cannot trigger this issue. This issue affects: Juniper Networks Junos OS on MX Series with MPC10E or MPC11E and PTX10001: 19.2 versions prior to 19.2R1-S4, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S1, 19.4R2. Juniper Networks Junos OS Evolved on on QFX5220, and PTX10003 series: 19.2-EVO versions; 19.3-EVO versions; 19.4-EVO versions prior to 19.4R2-EVO. This issue does not affect Junos OS versions prior to 19.2R1. This issue does not affect Junos OS Evolved versions prior to 19.2R1-EVO.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.32%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

0.00 pp

From 1.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.32%

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

Juniper2 products
  • junos19.2 | 19.2:r1 | 19.2:r1-s1 | 19.2:r1-s2 | 19.2:r1-s3 | 19.3:r1 | 19.3:r1-s1 | 19.3:r2 | 19.3:r2-s1 | 19.4:r1
  • junos_os_evolved19.2:r1 | 19.3:r2 | 19.4:r1
Juniper networks2 products
  • junos os≥ 19.2, < 19.2R1-S4, 19.2R2 | ≥ 19.3, < 19.3R2-S2, 19.3R3 | ≥ 19.4, < 19.4R1-S1, 19.4R2
  • junos os evolved19.2-EVO | 19.3-EVO 19.2-EVO | ≥ 19.4-EVO, < 19.4R2-EVO

2 vendors · 4 products

References

1 links