CVE-2021-34741
Last modified
CVE-2021-34741 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. EPSS estimates a 1.25% chance of exploitation in the next 30 days.
Description
A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and resulting in a DoS condition.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Asyncos | < 13.0.4 |
| Cisco | Asyncos | 13.5.3-010 |
| Cisco | Asyncos | 13.7.0-093 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-34741?
How severe is CVE-2021-34741?
How do I fix CVE-2021-34741?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-34736A vulnerability in the web-based management interface of Cis…7.5
- CVE-2021-34737A vulnerability in the DHCP version 4 (DHCPv4) server featur…7.5
- CVE-2021-34738Multiple vulnerabilities in the web-based management interfa…6.1
- CVE-2021-34739A vulnerability in the web-based management interface of mul…8.1
- CVE-2021-3474There's a flaw in OpenEXR in versions before 3.0.0-beta. A c…5.3
- CVE-2021-34740A vulnerability in the WLAN Control Protocol (WCP) implement…7.4
- CVE-2021-34742A vulnerability in the web-based management interface of Cis…6.1
- CVE-2021-34743A vulnerability in the application integration feature of Ci…7.1
- CVE-2021-34744Multiple vulnerabilities in Cisco Business 220 Series Smart …4.9
- CVE-2021-34745A vulnerability in the AppDynamics .NET Agent for Windows co…7.8
- CVE-2021-34746A vulnerability in the TACACS+ authentication, authorization…9.8
- CVE-2021-34748A vulnerability in the web-based management interface of Cis…8.8
Are you affected by CVE-2021-34741?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST