The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system
Published Sep 28, 2017 ·Due Mar 24, 2022
9.8
CRITICALCVSS 3.1
EPSS 13.77%
Description
The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system. The attacker could also cause an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a buffer overflow condition in the DHCP relay subsystem of the affected software. An attacker could exploit this vulnerability by sending a crafted DHCP Version 4 (DHCPv4) packet to an affected system. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a DoS condition. Cisco Bug IDs: CSCsm45390, CSCuw77959.
Affected products
- Vendor n/a Product Cisco IOS and IOS XE Defaultn/a
- Version Cisco IOS and IOS XEStatusaffectedConstraints-
- 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 and IOS XE | 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:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:C/I:C/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
TotalDecision
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 (33 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 13.77% (0.13773) | 96.40th | v5 (v2026.06.15) |
| Jun 15, 2026 | 13.52% (0.13521) | 95.95th | v5 (v2026.06.15) |
| Jun 1, 2026 | 10.67% (0.10670) | 93.44th | v4 (v2025.03.14) |
| Apr 22, 2026 | 13.61% (0.13611) | 94.27th | v4 (v2025.03.14) |
| Mar 29, 2026 | 12.30% (0.12299) | 93.82th | v4 (v2025.03.14) |
| Mar 4, 2026 | 7.92% (0.07919) | 91.88th | v4 (v2025.03.14) |
| Feb 19, 2026 | 9.90% (0.09901) | 92.85th | v4 (v2025.03.14) |
| Dec 29, 2025 | 7.96% (0.07962) | 91.77th | v4 (v2025.03.14) |
| Dec 25, 2025 | 21.78% (0.21777) | 95.56th | v4 (v2025.03.14) |
| Dec 22, 2025 | 19.62% (0.19617) | 95.22th | v4 (v2025.03.14) |
| Dec 20, 2025 | 16.82% (0.16817) | 94.73th | v4 (v2025.03.14) |
| Oct 22, 2025 | 17.89% (0.17890) | 94.83th | v4 (v2025.03.14) |
| Sep 7, 2025 | 24.94% (0.24938) | 95.95th | v4 (v2025.03.14) |
| Mar 30, 2025 | 19.96% (0.19962) | 94.99th | v4 (v2025.03.14) |
| Mar 29, 2025 | 35.70% (0.35705) | 95.49th | v4 (v2025.03.14) |
| Mar 17, 2025 | 19.96% (0.19962) | 95.00th | v4 (v2025.03.14) |
| Dec 17, 2024 | 22.33% (0.22330) | 96.50th | v3 (v2023.03.01) |
| Jul 19, 2024 | 6.11% (0.06113) | 93.61th | v3 (v2023.03.01) |
| Jul 17, 2024 | 9.78% (0.09779) | 94.86th | v3 (v2023.03.01) |
| Sep 8, 2023 | 5.18% (0.05178) | 92.02th | v3 (v2023.03.01) |
| Aug 8, 2023 | 5.06% (0.05056) | 91.88th | v3 (v2023.03.01) |
| Jun 14, 2023 | 3.55% (0.03554) | 90.27th | v3 (v2023.03.01) |
| May 8, 2023 | 2.15% (0.02155) | 87.60th | v3 (v2023.03.01) |
| Mar 31, 2023 | 1.70% (0.01696) | 85.85th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.38% (0.02385) | 88.14th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.79% (0.03795) | 85.54th | v2 (v2022.01.01) |
| Jun 25, 2022 | 3.79% (0.03795) | 84.46th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.69% (0.03693) | 83.51th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.69% (0.03693) | 66.67th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.38% (0.03375) | 66.63th | v1 |
| Jan 6, 2022 | 3.38% (0.03375) | 66.31th | v1 |
| Sep 1, 2021 | 3.38% (0.03375) | 81.66th | v1 |
| Apr 14, 2021 | 3.38% (0.03375) | 0.00th | v1 |
References (6)
- http://www.securityfocus.com/bid/101034 vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039445 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390 x_refsource_CONFIRMVendor Advisory
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959 x_refsource_CONFIRMVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp x_refsource_CONFIRMVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12240 government-resourceUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/101034 | vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1039445 | vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry | |
| https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390 | x_refsource_CONFIRMVendor Advisory | |
| https://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959 | x_refsource_CONFIRMVendor Advisory | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp | x_refsource_CONFIRMVendor Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12240 | government-resourceUS Government Resource |
Change history (0)
No recorded changes yet.