BugZero | Cisco BugID CSCwd47278 - 256 / 1550 Block leak with TLS1.3 session

Cisco - Defect ID: CSCwd47278

256 / 1550 Block leak with TLS1.3 session

Cisco - Defect ID: CSCwd47278

256 / 1550 Block leak with TLS1.3 session

Last updated on July 9th, 2025

BugZero Risk Score
7.8 High

Overall: 7.8

Severity: 8.2

Lifecycle: 9.1

Popularity: 5.1

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Bug Details

Description

Symptom

memory block leak of either 256 or 1550 byte block size pointing to ssl_decrypt_cb function Device may hang and fail to pass traffic until rebooted

Conditions

VPN functions in use

Workaround

n/a - reboot to recover

Further Problem Description

Change history

2025-08-04 Added: 9.16.4.84, 9.18.4.57

2025-08-03 Added: 9.16.4.84, 9.18.4.57

2025-08-02 Added: 9.16.4.84, 9.18.4.57

2025-08-01 Added: 9.16.4.84, 9.18.4.57

2025-07-31 Added: 9.16.4.84, 9.18.4.57

2025-07-30 Added: 9.16.4.84, 9.18.4.57

2025-07-29 Added: 9.16.4.84, 9.18.4.57

2025-07-28 Added: 9.16.4.84, 9.18.4.57

2025-07-27 Added: 9.16.4.84, 9.18.4.57

2025-07-26 Added: 9.16.4.84, 9.18.4.57

2025-07-25 Added: 9.16.4.84, 9.18.4.57

2025-07-24 Added: 9.16.4.84, 9.18.4.57

2025-07-23 Added: 9.16.4.84, 9.18.4.57

2025-07-22 Added: 9.16.4.84, 9.18.4.57

2025-07-21 Added: 9.16.4.84, 9.18.4.57

2025-07-20 Added: 9.16.4.84, 9.18.4.57

2025-07-19 Added: 9.16.4.84, 9.18.4.57

2025-07-18 Added: 9.16.4.84, 9.18.4.57

2025-07-17 Added: 9.16.4.84, 9.18.4.57

2025-03-27 Added: 9.10.1, 9.10.1.10, 9.10.1.11, 9.10.1.17, 9.10.1.2, 9.10.1.22, 9.10.1.27, 9.10.1.30, 9.10.1.32, 9.10.1.37, 9.10.1.40, 9.10.1.42, 9.10.1.44, 9.10.1.7, 9.12.1, 9.12.1.2, 9.12.1.3, 9.12.2, 9.12.2.1, 9.12.2.4, 9.12.2.5, 9.12.2.9, 9.12.3, 9.12.3.12, 9.12.3.2, 9.12.3.7, 9.12.3.9, 9.12.4, 9.12.4.10, 9.12.4.13, 9.12.4.18, 9.12.4.2, 9.12.4.24, 9.12.4.26, 9.12.4.29, 9.12.4.30, 9.12.4.35, 9.12.4.37, 9.12.4.38, 9.12.4.39, 9.12.4.4, 9.12.4.40, 9.12.4.41, 9.12.4.47, 9.12.4.48, 9.12.4.50, 9.12.4.52, 9.12.4.54, 9.12.4.55, 9.12.4.56, 9.12.4.58, 9.12.4.62, 9.12.4.65, 9.12.4.67, 9.12.4.7, 9.12.4.8, 9.13.1, 9.13.1.10, 9.13.1.12, 9.13.1.13, 9.13.1.16, 9.13.1.19, 9.13.1.2, 9.13.1.21, 9.13.1.7, 9.14.1, 9.14.1.10, 9.14.1.15, 9.14.1.19, 9.14.1.30, 9.14.1.6, 9.14.2, 9.14.2.13, 9.14.2.15, 9.14.2.4, 9.14.2.8, 9.14.3, 9.14.3.1, 9.14.3.11, 9.14.3.13, 9.14.3.15, 9.14.3.18, 9.14.3.9, 9.14.4, 9.14.4.12, 9.14.4.13, 9.14.4.14, 9.14.4.15, 9.14.4.17, 9.14.4.22, 9.14.4.23, 9.14.4.24, 9.14.4.6, 9.14.4.7, 9.15.1, 9.15.1.1, 9.15.1.10, 9.15.1.15, 9.15.1.16, 9.15.1.17, 9.15.1.21, 9.15.1.7, 9.16.1, 9.16.1.28, 9.16.2, 9.16.2.11, 9.16.2.13, 9.16.2.14, 9.16.2.3, 9.16.2.7, 9.16.3, 9.16.3.14, 9.16.3.15, 9.16.3.19, 9.16.3.23, 9.16.3.3, 9.16.4, 9.16.4.14, 9.16.4.18, 9.16.4.19, 9.16.4.27, 9.16.4.38, 9.16.4.39, 9.16.4.42, 9.16.4.48, 9.16.4.55, 9.16.4.57, 9.16.4.61, 9.16.4.62, 9.16.4.67, 9.16.4.70, 9.16.4.71, 9.16.4.76, 9.16.4.82, 9.16.4.9, 9.17.1, 9.17.1.10, 9.17.1.11, 9.17.1.13, 9.17.1.15, 9.17.1.20, 9.17.1.30, 9.17.1.33, 9.17.1.39, 9.17.1.45, 9.17.1.46, 9.17.1.7, 9.17.1.9, 9.18.1, 9.18.1.3, 9.18.2, 9.18.2.5, 9.18.2.7, 9.18.2.8, 9.18.3, 9.18.3.39, 9.18.3.46, 9.18.3.53, 9.18.3.55, 9.18.3.56, 9.18.4, 9.18.4.22, 9.18.4.24, 9.18.4.29, 9.18.4.34, 9.18.4.40, 9.18.4.47, 9.18.4.5, 9.18.4.50, 9.18.4.52, 9.18.4.53, 9.18.4.8, 9.19.1, 9.19.1.12, 9.19.1.18, 9.19.1.22, 9.19.1.24, 9.19.1.5, 9.19.1.9, 9.8.1, 9.8.1.5, 9.8.1.7, 9.8.2, 9.8.2.14, 9.8.2.15, 9.8.2.17, 9.8.2.20, 9.8.2.24, 9.8.2.26, 9.8.2.28, 9.8.2.33, 9.8.2.35, 9.8.2.38, 9.8.2.45, 9.8.2.8, 9.8.3, 9.8.3.11, 9.8.3.14, 9.8.3.16, 9.8.3.18, 9.8.3.21, 9.8.3.26, 9.8.3.29, 9.8.3.8, 9.8.4, 9.8.4.10, 9.8.4.12, 9.8.4.15, 9.8.4.17, 9.8.4.20, 9.8.4.22, 9.8.4.25, 9.8.4.26, 9.8.4.29, 9.8.4.3, 9.8.4.32, 9.8.4.33, 9.8.4.34, 9.8.4.35, 9.8.4.39, 9.8.4.40, 9.8.4.41, 9.8.4.43, 9.8.4.44, 9.8.4.45, 9.8.4.46, 9.8.4.48, 9.8.4.7, 9.8.4.8, 9.9.1, 9.9.1.2, 9.9.1.3, 9.9.1.4, 9.9.1.5, 9.9.2, 9.9.2.1, 9.9.2.14, 9.9.2.18, 9.9.2.235, 9.9.2.25, 9.9.2.27, 9.9.2.32, 9.9.2.36, 9.9.2.40, 9.9.2.47, 9.9.2.50, 9.9.2.52, 9.9.2.56, 9.9.2.59, 9.9.2.61, 9.9.2.66, 9.9.2.67, 9.9.2.74, 9.9.2.80, 9.9.2.83, 9.9.2.85, 9.9.2.9

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:9.10.1, 9.10.1.10, 9.10.1.11, 9.10.1.17, 9.10.1.2, 9.10.1.22, 9.10.1.27, 9.10.1.30, 9.10.1.32, 9.10.1.37, 9.10.1.40, 9.10.1.42, 9.10.1.44, 9.10.1.7, 9.12.1, 9.12.1.2, 9.12.1.3, 9.12.2, 9.12.2.1, 9.12.2.4, 9.12.2.5, 9.12.2.9, 9.12.3, 9.12.3.12, 9.12.3.2, 9.12.3.7, 9.12.3.9, 9.12.4, 9.12.4.10, 9.12.4.13, 9.12.4.18, 9.12.4.2, 9.12.4.24, 9.12.4.26, 9.12.4.29, 9.12.4.30, 9.12.4.35, 9.12.4.37, 9.12.4.38, 9.12.4.39, 9.12.4.4, 9.12.4.40, 9.12.4.41, 9.12.4.47, 9.12.4.48, 9.12.4.50, 9.12.4.52, 9.12.4.54, 9.12.4.55, 9.12.4.56, 9.12.4.58, 9.12.4.62, 9.12.4.65, 9.12.4.67, 9.12.4.7, 9.12.4.8, 9.13.1, 9.13.1.10, 9.13.1.12, 9.13.1.13, 9.13.1.16, 9.13.1.19, 9.13.1.2, 9.13.1.21, 9.13.1.7, 9.14.1, 9.14.1.10, 9.14.1.15, 9.14.1.19, 9.14.1.30, 9.14.1.6, 9.14.2, 9.14.2.13, 9.14.2.15, 9.14.2.4, 9.14.2.8, 9.14.3, 9.14.3.1, 9.14.3.11, 9.14.3.13, 9.14.3.15, 9.14.3.18, 9.14.3.9, 9.14.4, 9.14.4.12, 9.14.4.13, 9.14.4.14, 9.14.4.15, 9.14.4.17, 9.14.4.22, 9.14.4.23, 9.14.4.24, 9.14.4.6, 9.14.4.7, 9.15.1, 9.15.1.1, 9.15.1.10, 9.15.1.15, 9.15.1.16, 9.15.1.17, 9.15.1.21, 9.15.1.7, 9.16.1, 9.16.1.28, 9.16.2, 9.16.2.11, 9.16.2.13, 9.16.2.14, 9.16.2.3, 9.16.2.7, 9.16.3, 9.16.3.14, 9.16.3.15, 9.16.3.19, 9.16.3.23, 9.16.3.3, 9.16.4, 9.16.4.14, 9.16.4.18, 9.16.4.19, 9.16.4.27, 9.16.4.38, 9.16.4.39, 9.16.4.42, 9.16.4.48, 9.16.4.55, 9.16.4.57, 9.16.4.61, 9.16.4.62, 9.16.4.67, 9.16.4.70, 9.16.4.71, 9.16.4.76, 9.16.4.82, 9.16.4.84, 9.16.4.9, 9.17.1, 9.17.1.10, 9.17.1.11, 9.17.1.13, 9.17.1.15, 9.17.1.20, 9.17.1.30, 9.17.1.33, 9.17.1.39, 9.17.1.45, 9.17.1.46, 9.17.1.7, 9.17.1.9, 9.18.1, 9.18.1.3, 9.18.2, 9.18.2.5, 9.18.2.7, 9.18.2.8, 9.18.3, 9.18.3.39, 9.18.3.46, 9.18.3.53, 9.18.3.55, 9.18.3.56, 9.18.4, 9.18.4.22, 9.18.4.24, 9.18.4.29, 9.18.4.34, 9.18.4.40, 9.18.4.47, 9.18.4.5, 9.18.4.50, 9.18.4.52, 9.18.4.53, 9.18.4.57, 9.18.4.8, 9.19.1, 9.19.1.12, 9.19.1.18, 9.19.1.22, 9.19.1.24, 9.19.1.5, 9.19.1.9, 9.8.1, 9.8.1.5, 9.8.1.7, 9.8.2, 9.8.2.14, 9.8.2.15, 9.8.2.17, 9.8.2.20, 9.8.2.24, 9.8.2.26, 9.8.2.28, 9.8.2.33, 9.8.2.35, 9.8.2.38, 9.8.2.45, 9.8.2.8, 9.8.3, 9.8.3.11, 9.8.3.14, 9.8.3.16, 9.8.3.18, 9.8.3.21, 9.8.3.26, 9.8.3.29, 9.8.3.8, 9.8.4, 9.8.4.10, 9.8.4.12, 9.8.4.15, 9.8.4.17, 9.8.4.20, 9.8.4.22, 9.8.4.25, 9.8.4.26, 9.8.4.29, 9.8.4.3, 9.8.4.32, 9.8.4.33, 9.8.4.34, 9.8.4.35, 9.8.4.39, 9.8.4.40, 9.8.4.41, 9.8.4.43, 9.8.4.44, 9.8.4.45, 9.8.4.46, 9.8.4.48, 9.8.4.7, 9.8.4.8, 9.9.1, 9.9.1.2, 9.9.1.3, 9.9.1.4, 9.9.1.5, 9.9.2, 9.9.2.1, 9.9.2.14, 9.9.2.18, 9.9.2.235, 9.9.2.25, 9.9.2.27, 9.9.2.32, 9.9.2.36, 9.9.2.40, 9.9.2.47, 9.9.2.50, 9.9.2.52, 9.9.2.56, 9.9.2.59, 9.9.2.61, 9.9.2.66, 9.9.2.67, 9.9.2.74, 9.9.2.80, 9.9.2.83, 9.9.2.85, 9.9.2.9

Fixed versions: No known fixed versions

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: No known fixed versions

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OPERATIONAL DEFECT DATABASE

Cisco - Defect ID: CSCwd47278

256 / 1550 Block leak with TLS1.3 session

Cisco - Defect ID: CSCwd47278

256 / 1550 Block leak with TLS1.3 session

Last updated on July 9th, 2025

BugZero Risk Score7.8 High

Bug Details

Symptom

Conditions

Workaround

Further Problem Description

Links

Top Cisco Defects by Risk Score

Ready to prevent the next vendor outage?

BugZero Risk Score
7.8 High