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Vulnerability record · CVE-2021-1312 · published 20 January 2021

CVE-2021-1312: Cisco elastic services controller uncontrolled resource consumption vulnerability

Cisco · Elastic Services Controller

A vulnerability in the system resource management of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) to the health monitor API on an affected device. The vulnerability is due to inadequate provisioning of kernel parameters for the maximum number of TCP connections and SYN backlog. An attacker could exploit this vulnerability by sending a flood of crafted TCP packets to an affected device. A successful exploit could allow the attacker to block TCP listening ports that are used by the health monitor API. This vulnerability only affects customers who use the health monitor API.

7.5 CVSS 3.1 High EPSS 2.5% · top 15.7% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 5.0
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability in the system resource management of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) to the health monitor API on an affected device. The vulnerability is due to inadequate provisioning of kernel parameters for the maximum number of TCP connections and SYN backlog. An attacker could exploit this vulnerability by sending a flood of crafted TCP packets to an affected device. A successful exploit could allow the attacker to block TCP listening ports that are used by the health monitor API. This vulnerability only affects customers who use the health monitor API.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esc-dos-4Gw6D527 Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esc-dos-4Gw6D527 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2019-1867Cisco elastic services controller improper authentication vulnerabilityA vulnerability in the REST API of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to bypass authentication o…EPSS 30%9.8CVE-2018-0121Cisco elastic services controller improper authentication vulnerabilityA vulnerability in the authentication functionality of the web-based service portal of Cisco Elastic Services Controller Software could allow an unau…EPSS 2.5%9.8CVE-2017-6713Cisco elastic services controller permissions and access controls vulnerabilityA vulnerability in the Play Framework of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to gain full access …EPSS 2.9%8.8CVE-2017-6712Cisco elastic services controller os command injection vulnerabilityA vulnerability in certain commands of Cisco Elastic Services Controller could allow an authenticated, remote attacker to elevate privileges to root …EPSS 2.0%8.8CVE-2017-6683Cisco elastic services controller os command injection vulnerabilityA vulnerability in the esc_listener.py script of Cisco Elastic Services Controllers could allow an authenticated, remote attacker to execute arbitrar…EPSS 5.9%8.8CVE-2017-6689Cisco elastic services controller insecure default initialization vulnerabilityA vulnerability in the ConfD CLI of Cisco Elastic Services Controllers could allow an authenticated, remote attacker to log in to an affected system …EPSS 1.5%8.8CVE-2017-6684Cisco elastic services controller insecure default initialization vulnerabilityA vulnerability in Cisco Elastic Services Controllers could allow an authenticated, remote attacker to log in to an affected system as the Linux admi…EPSS 2.3%8.8CVE-2017-6682Cisco elastic services controller os command injection vulnerabilityA vulnerability in the ConfD CLI of Cisco Elastic Services Controllers could allow an authenticated, remote attacker to run arbitrary commands as the…EPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2021-1312), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.