Vulnerability Details : CVE-2021-1136
Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Products affected by CVE-2021-1136
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-1136
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-1136
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
Cisco Systems, Inc. | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST |
CWE ids for CVE-2021-1136
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: ykramarz@cisco.com (Primary)
References for CVE-2021-1136
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ioxr-l-zNhcGCBt
Cisco IOS XR Software for Cisco 8000 Series Routers and Network Convergence System 540 Series Routers Image Verification VulnerabilitiesVendor Advisory
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