CVE-2019-1686 Vulnerability Analysis & Exploit Details

CVE-2019-1686
Vulnerability Scoring

8.6
/10
Severe Risk

Cybersecurity professionals consider CVE-2019-1686 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-2019-1686 Details

Status: Modified

Last updated: 🕟 21 Nov 2024, 04:37 UTC
Originally published on: 🕙 17 Apr 2019, 22:29 UTC

Time between publication and last update: 2044 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2019-1686 Vulnerability Summary

CVE-2019-1686: A vulnerability in the TCP flags inspection feature for access control lists (ACLs) on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device. The vulnerability is due to incorrect processing of the ACL applied to an interface of an affected device when Cisco Express Forwarding load balancing using the 3-tuple hash algorithm is enabled. An attacker could exploit this vulnerability by sending traffic through an affected device that should otherwise be denied by the configured ACL. An exploit could allow the attacker to bypass protection offered by a configured ACL on the affected device. There are workarounds that address this vulnerability. Affected Cisco IOS XR versions are: Cisco IOS XR Software Release 5.1.1 and later till first fixed. First Fixed Releases: 6.5.2 and later, 6.6.1 and later.

Assessing the Risk of CVE-2019-1686

Access Complexity Graph

The exploitability of CVE-2019-1686 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-2019-1686

With low attack complexity and no required privileges, CVE-2019-1686 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-2019-1686, 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-2019-1686, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2019-1686 has no significant impact on data confidentiality.
  • Integrity: High
    CVE-2019-1686 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2019-1686 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.088% (probability of exploit)

EPSS Percentile: 40.03% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 59.97% of others.

CVE-2019-1686 References

External References

CWE Common Weakness Enumeration

NVD-CWE-Other

Vulnerable Configurations

  • cpe:2.3:o:cisco:ios_xr:5.1.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.1.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.1.1.k9sec:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.1.1.k9sec:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.1.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.1.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.1.3.03:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.1.3.03:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.1.4.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.1.4.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.2.0.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.0.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.4.00:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.2.4.00:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.5.ce:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.5.ce:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.2.6:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.2.6:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.3.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.3.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.3.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.3.3:sp10:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.3:sp10:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.4.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.4.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.3.0_base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.3.0_base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.4.3.ce:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.4.3.ce:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:5.0_base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:5.0_base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.0.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.0.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.0.2.01:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.2.01:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.2.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.2.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.0.4.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.0.4.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.3.01:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.1.3.01:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.1.4.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.1.4.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.2.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.3.base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.3.base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.2.25:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.3.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.3.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.3.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.3.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.3.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.3.15:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.3.3_base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.3.3_base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.4.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.4.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.4.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.4.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.4.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.4.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.4.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.4.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.4.1_base:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.4.1_base:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.5.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.5.0:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:x64:*
    cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:x64:*
  • cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.5.29:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.5.29:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xr:6.6.0:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xr:6.6.0:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*
  • 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_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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