A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack
Published Dec 15, 2017
5.9
MEDIUMCVSS 3.0
EPSS 12.80%
Description
A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack. An attacker could iteratively query a server running a vulnerable TLS stack implementation to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions. Cisco Bug IDs: CSCvg97652.
Affected products
- Vendor n/a Product Cisco legacy ASA 5500 products TLS protocol implementation Defaultn/a
- Version Cisco legacy ASA 5500 products TLS protocol implementationStatusaffectedConstraints-
- 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 legacy ASA 5500 products TLS protocol implementation | n/a |
|
Configuration 1
Running on/with
- n/a
Configuration 2
Running on/with
- n/a
Configuration 3
Running on/with
- n/a
Configuration 4
Running on/with
- n/a
Configuration 5
Running on/with
- n/a
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.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 12.80% (0.12798) | 96.17th | v5 (v2026.06.15) |
| Jun 15, 2026 | 12.80% (0.12798) | 95.76th | v5 (v2026.06.15) |
| Mar 17, 2026 | 66.94% (0.66944) | 98.53th | v4 (v2025.03.14) |
| Mar 30, 2025 | 62.42% (0.62423) | 98.21th | v4 (v2025.03.14) |
| Mar 29, 2025 | 76.44% (0.76444) | 98.61th | v4 (v2025.03.14) |
| Mar 17, 2025 | 62.42% (0.62423) | 98.20th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00149) | 52.39th | v3 (v2023.03.01) |
| May 8, 2023 | 0.15% (0.00149) | 49.53th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00182) | 53.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.52% (0.05521) | 79.91th | v1 |
| Jan 6, 2022 | 5.52% (0.05521) | 79.71th | v1 |
| Sep 1, 2021 | 5.52% (0.05521) | 88.55th | v1 |
| Apr 14, 2021 | 5.52% (0.05521) | 0.00th | v1 |
References (2)
- http://www.securityfocus.com/bid/102170 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/102170 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171212-bleichenbacher | x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory |
Change history (0)
No recorded changes yet.