CVE-2025-20142 Vulnerability Analysis & Exploit Details

CVE-2025-20142
Vulnerability Scoring

8.6
/10
Severe Risk

Cybersecurity professionals consider CVE-2025-20142 an immediate threat requiring urgent mitigation.

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: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2025-20142 Details

Status: Analyzed

Last updated: 🕡 01 Aug 2025, 18:40 UTC
Originally published on: 🕓 12 Mar 2025, 16:15 UTC

Time between publication and last update: 142 days

CVSS Release: version 3

CVSS3 Source

psirt@cisco.com

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2025-20142 Vulnerability Summary

CVE-2025-20142: A vulnerability in the IPv4 access control list (ACL) feature and quality of service (QoS) policy feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed IPv4 packets that are received on line cards where the interface has either an IPv4 ACL or QoS policy applied. An attacker could exploit this vulnerability by sending crafted IPv4 packets through an affected device. A successful exploit could allow the attacker to cause network processor errors, resulting in a reset or shutdown of the network process. Traffic over that line card would be lost while the line card reloads. Note: This vulnerability has predominantly been observed in Layer 2 VPN (L2VPN) environments where an IPv4 ACL or QoS policy has been applied to the bridge virtual interface. Layer 3 configurations where the interface has either an IPv4 ACL or QoS policy applied are also affected, though the vulnerability has not been observed.

Assessing the Risk of CVE-2025-20142

Access Complexity Graph

The exploitability of CVE-2025-20142 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-2025-20142

With low attack complexity and no required privileges, CVE-2025-20142 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-2025-20142, 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-2025-20142, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2025-20142 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2025-20142 poses no threat to data integrity.
  • Availability: High
    CVE-2025-20142 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: 0.046% (probability of exploit)

EPSS Percentile: 19.91% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 80.09% of others.

CVE-2025-20142 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.7.35:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.7.35:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.9.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.9.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.9.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.9.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.1.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.1.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.1.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.1.15:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.1.15:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.1.25:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.1.25:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.3.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.3.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.3.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.3.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.3.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.3.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.3.4:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.3.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.3.5:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.3.5:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.4.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.4.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.4.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.4.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.5.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.5.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.5.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.5.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.5.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.5.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.5.4:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.5.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.5.5:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.5.5:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.6.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.6.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.6.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.6.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.7.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.7.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.7.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.7.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.8.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.8.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.8.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.8.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.8.22:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.8.22:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.8.23:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.8.23:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.9.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.9.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.9.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.9.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:7.10.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:7.10.1:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9902:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*

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