Azure Access BLU-IC2/BLU-IC4 up to 1.19.5 missing validation of openssl certificate

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Azure Access BLU-IC2 and BLU-IC4 up to 1.19.5. Impacted is an unknown function. The manipulation leads to missing validation of openssl certificate. This vulnerability is listed as CVE-2025-12553. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Azure Access BLU-IC2 and BLU-IC4 up to 1.19.5 and classified as very critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a missing validation of openssl certificate vulnerability. Using CWE to declare the problem leads to CWE-599. The product uses OpenSSL and trusts or uses a certificate without using the SSL_get_verify_result() function to ensure that the certificate satisfies all necessary security requirements. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Email Server Certificate Verification Disabled.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.

The weakness was presented by Kevin Schaller, Benjamin Lafois, Alexi Bitsios, Sebastian Toscano and Dominik Schneider. It is possible to read the advisory at azure-access.com. The identification of this vulnerability is CVE-2025-12553 since 10/31/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/10/2025). The attack technique deployed by this issue is T1557.003 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.8

VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing validation of openssl certificate
CWE: CWE-599 / CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/31/2025 Advisory disclosed
10/31/2025 +0 days CVE reserved
10/31/2025 +0 days VulDB entry created
11/10/2025 +10 days VulDB entry last update

Sourcesinfo

Advisory: azure-access.com
Researcher: Kevin Schaller, Benjamin Lafois, Alexi Bitsios, Sebastian Toscano, Dominik Schneider
Status: Confirmed

CVE: CVE-2025-12553 (🔒)
GCVE (CVE): GCVE-0-2025-12553
GCVE (VulDB): GCVE-100-330863

Entryinfo

Created: 10/31/2025 22:52
Updated: 11/10/2025 18:34
Changes: 10/31/2025 22:52 (64), 11/10/2025 18:34 (9)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!