Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway Denial of Service Vulnerability
Priority MEDIUM 43CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
A vulnerability in the Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of transient SIP packets on which NAT is performed on an affected device. An attacker could exploit this vulnerability by using UDP port 5060 to send crafted SIP packets through an affected device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01967 80th percentileScored 2026-11-07
Fix Fixed Cisco IOS XE Software (Cisco): 3.2.11aSG
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco IOS XE Software | before 3.2.11aSG | 3.2.11aSG | Patch available | CNA |
- Cisco IOS XE Software VendorCisco Affected before 3.2.11aSG Fixed in 3.2.11aSG Patch available CNA
CPE configurations NVD · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xe:15.4\(3\)s:*:*:*:*:*:*:* | 15.4(3)s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:15.5\(3\)s:*:*:*:*:*:*:* | 15.5(3)s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:15.6\(1\)s:*:*:*:*:*:*:* | 15.6(1)s | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.3.1:*:*:*:*:*:*:* | 16.3.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.4.1:*:*:*:*:*:*:* | 16.4.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.5.1:*:*:*:*:*:*:* | 16.5.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:* | 16.6.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:* | 16.7.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:* | 16.8.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:* | 16.9.1 | Vulnerable | Cisco |
- cpe:2.3:o:cisco:ios_xe:15.4\(3\)s:*:*:*:*:*:*:* Versions 15.4(3)s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:15.5\(3\)s:*:*:*:*:*:*:* Versions 15.5(3)s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:15.6\(1\)s:*:*:*:*:*:*:* Versions 15.6(1)s Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.3.1:*:*:*:*:*:*:* Versions 16.3.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.4.1:*:*:*:*:*:*:* Versions 16.4.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.5.1:*:*:*:*:*:*:* Versions 16.5.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:* Versions 16.6.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:* Versions 16.7.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:* Versions 16.8.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:* Versions 16.9.1 Vulnerable ·Cisco
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* | 16.10.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* | 16.11.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* | 16.12.1 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:1100-4p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:1100-8p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:1101-4p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:1109-2p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:1109-4p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:1111x-8p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:csr_1000v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:encs_5100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:encs_5400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:isrv:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* Versions 16.10.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* Versions 16.11.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* Versions 16.12.1 Vulnerable ·Cisco
- cpe:2.3:h:cisco:1100-4p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:1100-8p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:1101-4p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:1109-2p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:1109-4p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:1111x-8p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:csr_1000v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:encs_5100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:encs_5400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:isrv:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
- Fix · CNA Cisco IOS XE Software (Cisco) Fixed in 3.2.11aSG
Timeline
- 2026-10-02 Threatist record created from CVE-2019-12646
- 2026-10-03 Alias added: GHSA-j86j-prqg-7fpq
References
More Cisco Ios Xe vulnerabilities
- TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
- TI-2018-00122 Memory corruption in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
- TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
- TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
- TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
- TI-2017-04497 Memory corruption in Cisco IOS XE Software KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2019-12646 · CVE Program
- CVE-2019-12646 · NVD
- FIRST EPSS
- GHSA-j86j-prqg-7fpq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences