CVE-2021-1619
Cisco IOS XE Software NETCONF and RESTCONF Authentication Bypass Vulnerability
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
9.8
Cisco IOS XE Software NETCONF and RESTCONF Authentication Bypass Vulnerability
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
- Record
CVE-2021-1619- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-824
- Updated
- 2026-11-02
EUVDEUVD-2021-7086
9.8
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
- Record
EUVD-2021-7086- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-q3g7-fff3-j4mq
9.1
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS...
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
- Record
GHSA-q3g7-fff3-j4mq- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-824, CWE-908
- Updated
- 2026-11-02
NVD
9.8
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
- Record
CVE-2021-1619- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:P - Weakness
- CWE-824, CWE-908
- Updated
- 2026-11-02
Affected products
- cisco ios xe software
- cisco ios xe
- cisco ios xe sd-wan
- cisco ios xe sd-wan 16.10.1 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.1 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.1 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.1 when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.2 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.2 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.2 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.2 when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.3 when installed on 1000 series integrated services
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- cisco ios xe sd-wan 16.10.3 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.3 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.3 when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.3a when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.3a when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.3a when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.3a when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.10.3a when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.3b when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.3b when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.3b when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.3b when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.10.3b when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.4 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.4 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.4 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.4 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.10.4 when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.5 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.5 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.5 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.5 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.10.5 when installed on integrated services virtual
- cisco ios xe sd-wan 16.10.6 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.10.6 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.10.6 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.10.6 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.10.6 when installed on integrated services virtual
- cisco ios xe sd-wan 16.11.1 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.11.1 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.11.1 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.11.1 when installed on integrated services virtual
- cisco ios xe sd-wan 16.11.1a when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.11.1a when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.11.1a when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.11.1a when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.11.1a when installed on integrated services virtual
- cisco ios xe sd-wan 16.11.1b when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.11.1b when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.11.1b when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.11.1b when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.11.1b when installed on integrated services virtual
- cisco ios xe sd-wan 16.11.1d when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.11.1d when installed on integrated services virtual
- cisco ios xe sd-wan 16.11.1f when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.11.1s when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.11.1s when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.11.1s when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.11.1s when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.11.1s when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1 when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1 when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1a when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1a when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1a when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1a when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1a when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1a when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1b1 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1b1 when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1b1 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1b1 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1b1 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1b1 when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1b when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1b when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1b when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1b when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1b when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1b when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1c when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1c when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1c when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1c when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1c when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1c when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1d when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1d when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1d when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1d when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1d when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1d when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.1e when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.1e when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.1e when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.1e when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.1e when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.1e when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.2r when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.2r when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.2r when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.2r when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.2r when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.2r when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.3 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.3 when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.3 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.3 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.3 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.3 when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.4 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.4 when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.4 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.4 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.4 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.4 when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.4a when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.4a when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.4a when installed on integrated services virtual
- cisco ios xe sd-wan 16.12.5 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.12.5 when installed on 1100 series industrial integrated services
- cisco ios xe sd-wan 16.12.5 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.12.5 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.12.5 when installed on cloud services router 1000v
- cisco ios xe sd-wan 16.12.5 when installed on integrated services virtual
- cisco ios xe sd-wan 16.9.1 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.9.1 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.9.1 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.9.1 when installed on integrated services virtual
- cisco ios xe sd-wan 16.9.2 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.9.2 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.9.2 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.9.2 when installed on integrated services virtual
- cisco ios xe sd-wan 16.9.3 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.9.3 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.9.3 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.9.3 when installed on integrated services virtual
- cisco ios xe sd-wan 16.9.4 when installed on 1000 series integrated services
- cisco ios xe sd-wan 16.9.4 when installed on 4000 series integrated services
- cisco ios xe sd-wan 16.9.4 when installed on asr 1000 series aggregation services
- cisco ios xe sd-wan 16.9.4 when installed on integrated services virtual
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-1619 is a critical vulnerability (CVSS 9.8) in Cisco Ios Xe Software, published September 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.76%, the 78th percentile. No source names a fixed version.