CVE-2020-1685 Vulnerability Analysis & Exploit Details

Status: Analyzed - Last modified: 05 Feb 2021, 16:49 UTC Published: 16 Oct 2020, 21:15 UTC

CVE-2020-1685
Vulnerability Scoring

5.8
/10

Attack Complexity Details

  • Attack Complexity: Low Impact
  • Attack Vector: NETWORK
  • Privileges Required: None
  • Scope: CHANGED
  • User Interaction: NONE

CIA Impact Definition

  • Confidentiality:
  • Integrity: Low Impact
  • Availability:

CVE-2020-1685 Vulnerability Summary

When configuring stateless firewall filters in Juniper Networks EX4600 and QFX 5000 Series devices using Virtual Extensible LAN protocol (VXLAN), the discard action will fail to discard traffic under certain conditions. Given a firewall filter configuration similar to: family ethernet-switching { filter L2-VLAN { term ALLOW { from { user-vlan-id 100; } then { accept; } } term NON-MATCH { then { discard; } } when there is only one term containing a 'user-vlan-id' match condition, and no other terms in the firewall filter except discard, the discard action for non-matching traffic will only discard traffic with the same VLAN ID specified under 'user-vlan-id'. Other traffic (e.g. VLAN ID 200) will not be discarded. This unexpected behavior can lead to unintended traffic passing through the interface where the firewall filter is applied. This issue only affects systems using VXLANs. This issue affects Juniper Networks Junos OS on QFX5K Series: 18.1 versions prior to 18.1R3-S7, except 18.1R3; 18.2 versions prior to 18.2R2-S7, 18.2R3-S1; 18.3 versions prior to 18.3R1-S5, 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R1-S7, 18.4R2-S1, 18.4R3; 19.1 versions prior to 19.1R1-S5, 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2.

Access Complexity Graph

Above is the Access Complexity Graph for CVE-2020-1685. It helps visualize the difficulty level and privilege requirements needed to exploit this vulnerability, providing a quick assessment of its exploitation feasibility.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2020-1685, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

Impact Analysis

Below is the Impact Analysis for CVE-2020-1685, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.09% (probability of exploit)

EPSS Percentile: 40.64% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 59.36% of others.

CVE-2020-1685 Detailed Information and External References

References

CWE

CWE-203

CAPEC

  • Black Box Reverse Engineering CAPEC-189 An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.

Vulnerable Configurations

  • cpe:2.3:o:juniper:junos:18.1:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r2-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r2-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.1:r3-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.1:r3-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r1:-:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r1:-:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r1-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r1-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r1-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r2-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r2-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.2:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.2:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s4:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5100:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5100:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:*

CVSS3 Source

sirt@juniper.net

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

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