CVE-2023-36835 Vulnerability Analysis & Exploit Details

CVE-2023-36835
Vulnerability Scoring

7.5
/10
Very High Risk

Highly exploitable, CVE-2023-36835 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2023-36835 Details

Status: Modified

Last updated: 🕗 21 Nov 2024, 08:10 UTC
Originally published on: 🕕 14 Jul 2023, 18:15 UTC

Time between publication and last update: 495 days

CVSS Release: version 3

CVSS3 Source

sirt@juniper.net

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2023-36835 Vulnerability Summary

CVE-2023-36835: An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX10000 Series allows a network based attacker to cause a Denial of Service (DoS). If a specific valid IP packet is received and that packet needs to be routed over a VXLAN tunnel, this will result in a PFE wedge condition due to which traffic gets impacted. As this is not a crash and restart scenario, this condition will persist until the system is rebooted to recover. This issue affects Juniper Networks Junos OS on QFX10000: 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S5; 21.3 versions prior to 21.3R3-S4; 21.4 versions prior to 21.4R3-S1; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S2, 22.3R2.

Assessing the Risk of CVE-2023-36835

Access Complexity Graph

The exploitability of CVE-2023-36835 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2023-36835

With low attack complexity and no required privileges, CVE-2023-36835 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2023-36835, 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.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2023-36835, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2023-36835 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2023-36835 poses no threat to data integrity.
  • Availability: High
    CVE-2023-36835 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.089% (probability of exploit)

EPSS Percentile: 40.54% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 59.46% of others.

CVE-2023-36835 References

External References

CWE Common Weakness Enumeration

CWE-754

Vulnerable Configurations

  • cpe:2.3:o:juniper:junos:20.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.3:r3-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.3:r3-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:20.4:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:20.4:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.1:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.1:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.3:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.3:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:21.4:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:21.4:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.1:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.1:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:22.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:22.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx10002:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx10002:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx10002-60c:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx10002-60c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx10008:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx10008:-:*:*:*:*:*:*:*
  • cpe:2.3:h:juniper:qfx10016:-:*:*:*:*:*:*:*
    cpe:2.3:h:juniper:qfx10016:-:*:*:*:*:*:*:*

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