CVE-2019-1736
CVE-2019-1736 is a medium-severity vulnerability in Cisco Fmc1000-k9 Bios with a CVSS 3.x base score of 6.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.
Key facts
- Severity: Medium (CVSS 3.x base score 6.6)
- CVSS v2: 6.9
- EPSS exploit prediction: 0% (16th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-347
- Affected product: Cisco Fmc1000-k9 Bios
- Published:
- Last modified:
Description
A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.
Frequently asked questions
- What is CVE-2019-1736?
- A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.
- How severe is CVE-2019-1736?
- CVE-2019-1736 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-1736 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-1736?
- CVE-2019-1736 primarily affects Cisco Fmc1000-k9 Bios. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-1736?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-1736 published?
- CVE-2019-1736 was published on 2020-09-23 and last updated on 2026-06-17.
References
Affected products (23)
- cpe:2.3:o:cisco:fmc1000-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fmc1000-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fmc2500-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fmc2500-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fmc4500-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:fmc4500-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3515-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3515-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3595-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3595-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3615-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3615-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3655-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3655-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3695-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:sns-3695-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:tg5004-k9_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:tg5004-k9_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:tg5004-k9-rf_bios:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:tg5004-k9-rf_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:identity_services_engine:2.4\(0.357\):*:*:*:*:*:*:*
- cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):*:*:*:*:*:*:*
- cpe:2.3:a:cisco:unified_computing_system:3.2\(3h\)c:*:*:*:*:*:*:*
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