A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device
Published Sep 28, 2017 ·Due Mar 24, 2022
7.5
HIGHCVSS 3.1
EPSS 7.07%
Description
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to the improper translation of H.323 messages that use the Registration, Admission, and Status (RAS) protocol and are sent to an affected device via IPv4 packets. An attacker could exploit this vulnerability by sending a crafted H.323 RAS packet through an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to use an application layer gateway with NAT (NAT ALG) for H.323 RAS messages. By default, a NAT ALG is enabled for H.323 RAS messages. Cisco Bug IDs: CSCvc57217.
Affected products
- Vendor n/a Product Cisco IOS Defaultn/a
- Version Cisco IOSStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Cisco IOS | n/a |
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:C
Date Added
Mar 3, 2022
Patch Due
Mar 24, 2022
Required Action
Apply updates per vendor instructions.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Nov 8, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 7.07% (0.07070) | 94.02th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.94% (0.06938) | 93.26th | v5 (v2026.06.15) |
| Apr 22, 2026 | 9.35% (0.09350) | 92.79th | v4 (v2025.03.14) |
| Dec 17, 2025 | 6.80% (0.06802) | 90.98th | v4 (v2025.03.14) |
| Sep 7, 2025 | 14.05% (0.14049) | 94.10th | v4 (v2025.03.14) |
| Mar 30, 2025 | 10.85% (0.10850) | 92.73th | v4 (v2025.03.14) |
| Mar 29, 2025 | 32.97% (0.32970) | 95.14th | v4 (v2025.03.14) |
| Mar 17, 2025 | 10.85% (0.10850) | 92.84th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.35% (0.00347) | 71.97th | v3 (v2023.03.01) |
| Jul 19, 2024 | 0.35% (0.00347) | 71.97th | v3 (v2023.03.01) |
| Jul 17, 2024 | 0.49% (0.00492) | 76.39th | v3 (v2023.03.01) |
| Jun 10, 2024 | 0.36% (0.00360) | 72.25th | v3 (v2023.03.01) |
| Mar 24, 2024 | 0.43% (0.00430) | 73.98th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.30% (0.00303) | 68.84th | v3 (v2023.03.01) |
| Mar 31, 2023 | 0.30% (0.00303) | 65.03th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00333) | 66.56th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.30% (0.01300) | 31.12th | v1 |
| Jan 6, 2022 | 1.30% (0.01300) | 30.48th | v1 |
| Sep 1, 2021 | 1.30% (0.01300) | 69.44th | v1 |
| Apr 14, 2021 | 1.30% (0.01300) | 0.00th | v1 |
References (4)
- http://www.securityfocus.com/bid/101039 vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039449 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-nat x_refsource_CONFIRMVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12231 government-resourceUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/101039 | vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1039449 | vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-nat | x_refsource_CONFIRMVendor Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12231 | government-resourceUS Government Resource |
Change history (0)
No recorded changes yet.