ID
VAR-202009-1639
CVE
CVE-2020-3548
TITLE
Cisco Systems Cisco Email Security Appliance Algorithmic Complexity Vulnerabilities in
Trust: 0.8
DESCRIPTION
A vulnerability in the Transport Layer Security (TLS) protocol implementation of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient processing of incoming TLS traffic. An attacker could exploit this vulnerability by sending a series of crafted TLS packets to an affected device. A successful exploit could allow the attacker to trigger a prolonged state of high CPU utilization. The affected device would still be operative, but response time and overall performance may be degraded.There are no workarounds that address this vulnerability. Cisco Systems Cisco Email Security Appliance contains an algorithmic complexity vulnerability.Service operation interruption (DoS) It may be in a state
Trust: 1.62
AFFECTED PRODUCTS
| vendor: | cisco | model: | email security appliance | scope: | lte | version: | 13.5.1-277 | Trust: 1.0 |
| vendor: | シスコシステムズ | model: | cisco email security appliance | scope: | lte | version: | 13.5.1-277 and earlier | Trust: 0.8 |
| vendor: | シスコシステムズ | model: | cisco email security appliance | scope: | eq | version: | - | Trust: 0.8 |
CVSS
SEVERITY | CVSSV2 | CVSSV3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PROBLEMTYPE DATA
| problemtype: | CWE-407 | Trust: 1.0 |
| problemtype: | Algorithm complexity (CWE-407) [ others ] | Trust: 0.8 |
THREAT TYPE
remote
Trust: 0.6
TYPE
other
Trust: 0.6
PATCH
| title: | cisco-sa-esa-tls-dos-xW53TBhb | url: | https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-tls-dos-xW53TBhb | Trust: 0.8 |
EXTERNAL IDS
| db: | NVD | id: | CVE-2020-3548 | Trust: 3.2 |
| db: | JVNDB | id: | JVNDB-2020-018383 | Trust: 0.8 |
| db: | AUSCERT | id: | ESB-2020.3036 | Trust: 0.6 |
| db: | CNNVD | id: | CNNVD-202009-077 | Trust: 0.6 |
REFERENCES
| url: | https://sec.cloudapps.cisco.com/security/center/content/ciscosecurityadvisory/cisco-sa-esa-tls-dos-xw53tbhb | Trust: 1.0 |
| url: | https://nvd.nist.gov/vuln/detail/cve-2020-3548 | Trust: 0.8 |
| url: | https://tools.cisco.com/security/center/content/ciscosecurityadvisory/cisco-sa-esa-tls-dos-xw53tbhb | Trust: 0.6 |
| url: | https://www.auscert.org.au/bulletins/esb-2020.3036/ | Trust: 0.6 |
| url: | https://vigilance.fr/vulnerability/cisco-esa-overload-via-tls-33224 | Trust: 0.6 |
SOURCES
| db: | JVNDB | id: | JVNDB-2020-018383 |
| db: | CNNVD | id: | CNNVD-202009-077 |
| db: | NVD | id: | CVE-2020-3548 |
LAST UPDATE DATE
2025-08-04T23:41:46.185000+00:00
SOURCES UPDATE DATE
| db: | JVNDB | id: | JVNDB-2020-018383 | date: | 2025-08-01T08:45:00 |
| db: | CNNVD | id: | CNNVD-202009-077 | date: | 2021-01-04T00:00:00 |
| db: | NVD | id: | CVE-2020-3548 | date: | 2025-07-31T17:17:22.500 |
SOURCES RELEASE DATE
| db: | JVNDB | id: | JVNDB-2020-018383 | date: | 2025-08-01T00:00:00 |
| db: | CNNVD | id: | CNNVD-202009-077 | date: | 2020-09-02T00:00:00 |
| db: | NVD | id: | CVE-2020-3548 | date: | 2024-11-18T16:15:08.100 |