Cisco Web Security Appliance Decryption Policy Bypass Vulnerability
Published Feb 8, 2019
5.8
MEDIUMCVSS 3.0
EPSS 1.65%
Description
A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections. Releases 10.1.x and 10.5.x are affected.
Affected products
-
- Version 10.1StatusaffectedConstraints-
- Version 10.5StatusaffectedConstraints-
- 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Web Security Appliance (WSA) | n/a |
|
- 10.1.0-204
- 10.5.2-072
- 11.5.1-fcs-115
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:L/PR:N/UI:N/S:C/C:N/I:L/A:N
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Nov 19, 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 v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.65% (0.01645) | 75.58th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.65% (0.01645) | 75.38th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.11% (0.00107) | 44.02th | v3 (v2023.03.01) |
| Jun 29, 2024 | 0.11% (0.00107) | 43.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00094) | 38.39th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.46% (0.05463) | 76.57th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.63% (0.03634) | 72.14th | v1 |
| Jan 6, 2022 | 3.63% (0.03634) | 71.90th | v1 |
| Jan 5, 2022 | 0.83% (0.00833) | 59.62th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (2)
- http://www.securityfocus.com/bid/106904 vdb-entryx_refsource_BIDThird Party Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-wsa-bypass vendor-advisoryx_refsource_CISCOThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/106904 | vdb-entryx_refsource_BIDThird Party Advisory | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190206-wsa-bypass | vendor-advisoryx_refsource_CISCOThird Party Advisory |
Change history (0)
No recorded changes yet.