CVE-2019-12706
A vulnerability in the Sender Policy Framework (SPF) functionality of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the configured user filters on an affected device. The vulnerability exists because the affected software insufficiently validates certain incoming SPF messages. An attacker could exploit this vulnerability by sending a custom SPF packet to an affected device. A successful exploit could allow the attacker to bypass the configured header filters, which could allow malicious content to pass through the device.
Key facts
- CVSS score
- 7.5 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Weakness (CWE)
- CWE-20
- EPSS score
- 1.3% (70th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2019-4297)
- Published
- October 2, 2019
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2019-4297 in the EU Vulnerability Database. Last updated in EUVD on November 19, 2024.
View on the EU Vulnerability DatabaseAffected products
- cisco / email security appliance firmware
Certified products that may be affected
2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Cisco Email Security Appliance 9.8 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10798-2017 - archived
- Cisco Email Security Appliance v9.1 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10631-2015 - archived
References
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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