CVE-2021-1229 Vulnerability Analysis & Exploit Details

CVE-2021-1229
Vulnerability Scoring

5.8
/10
Significant Risk

Security assessments indicate that CVE-2021-1229 presents a notable risk, potentially requiring prompt 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-2021-1229 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:43 UTC
Originally published on: 🕗 24 Feb 2021, 20:15 UTC

Time between publication and last update: 1365 days

CVSS Release: version 3

CVSS3 Source

ykramarz@cisco.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-1229 Vulnerability Summary

CVE-2021-1229: A vulnerability in ICMP Version 6 (ICMPv6) processing in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a slow system memory leak, which over time could lead to a denial of service (DoS) condition. This vulnerability is due to improper error handling when an IPv6-configured interface receives a specific type of ICMPv6 packet. An attacker could exploit this vulnerability by sending a sustained rate of crafted ICMPv6 packets to a local IPv6 address on a targeted device. A successful exploit could allow the attacker to cause a system memory leak in the ICMPv6 process on the device. As a result, the ICMPv6 process could run out of system memory and stop processing traffic. The device could then drop all ICMPv6 packets, causing traffic instability on the device. Restoring device functionality would require a device reboot.

Assessing the Risk of CVE-2021-1229

Access Complexity Graph

The exploitability of CVE-2021-1229 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-2021-1229

With low attack complexity and no required privileges, CVE-2021-1229 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-2021-1229, 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-2021-1229, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2021-1229 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2021-1229 poses no threat to data integrity.
  • Availability: Low
    CVE-2021-1229 may slightly degrade system performance without fully affecting service availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.15% (probability of exploit)

EPSS Percentile: 52.57% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 47.43% of others.

CVE-2021-1229 References

External References

CWE Common Weakness Enumeration

CWE-401

Vulnerable Configurations

  • cpe:2.3:o:cisco:nx-os:5.2\(1\)sv5\(1.3a\):*:*:*:*:*:*:*
    cpe:2.3:o:cisco:nx-os:5.2\(1\)sv5\(1.3a\):*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_1000_virtual_edge_for_vmware_vsphere:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_1000_virtual_edge_for_vmware_vsphere:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_1000v_switch_for_microsoft_hyper-v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_1000v_switch_for_microsoft_hyper-v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_1000v_switch_for_vmware_vsphere:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_1000v_switch_for_vmware_vsphere:-:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:nx-os:8.4\(3.53\):*:*:*:*:*:*:*
    cpe:2.3:o:cisco:nx-os:8.4\(3.53\):*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:mds_9148s:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:mds_9148s:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:mds_9250i:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:mds_9250i:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:mds_9706:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:mds_9706:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:mds_9710:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:mds_9710:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3048:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3048:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_31108pv-v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_31108pv-v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_31108tc-v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_31108tc-v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_31128pq:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_31128pq:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3132c-z:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3132c-z:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3132q-v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3132q-v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3132q-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3132q-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3132q-xl:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3132q-xl:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3164q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3164q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3172pq:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3172pq:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3172pq-xl:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3172pq-xl:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3232c:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3232c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3264c-e:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3264c-e:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3264q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3264q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3408-s:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3408-s:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_34180yc:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_34180yc:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3432d-s:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3432d-s:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3464c:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3464c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3524-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3524-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3524-xl:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3524-xl:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3548-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3548-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3548-xl:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3548-xl:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_36180yc-r:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_36180yc-r:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_3636c-r:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_3636c-r:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5548p:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5548p:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5548up:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5548up:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5596t:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5596t:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5596up:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5596up:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_56128p:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_56128p:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5624q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5624q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5648q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5648q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5672up:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5672up:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5672up-16g:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5672up-16g:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_5696q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_5696q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_6001:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_6001:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_6004:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_6004:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_7000:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_7700:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9000v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9000v:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_92160yc-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_92160yc-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9221c:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9221c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_92300yc:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_92300yc:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_92304qc:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_92304qc:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_92348gc-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_92348gc-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9236c:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9236c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9272q:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9272q:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93108tc-ex-24:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93108tc-ex-24:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93108tc-fx-24:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93108tc-fx-24:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9316d-gx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9316d-gx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-ex-24:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-ex-24:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-fx-24:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-fx-24:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-fx3:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-fx3:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93180yc-fx3s:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93180yc-fx3s:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93216tc-fx2:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93216tc-fx2:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93240yc-fx2:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93240yc-fx2:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93360yc-fx2:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93360yc-fx2:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9336c-fx2-e:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9336c-fx2-e:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9336pq:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9336pq:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_93600cd-gx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_93600cd-gx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9364c:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9364c-gx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9364c-gx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9372px:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9396px:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:nexus_9508:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:nexus_9508:-:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:nx-os:15.1\(2.31\):*:*:*:*:*:*:*
    cpe:2.3:o:cisco:nx-os:15.1\(2.31\):*:*:*:*:*:*:*

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