Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-50577— ePA 3.x Integration: AES-GCM Nonce Reuse via Frozen VAU Request Counter

Quick assessment

Affected
fbeta-GmbH ePA3-Service-OpenSource
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fbeta ePA 3.x Integration是德国fbeta公司的一款Web服务集成组件。 fbeta ePA 3.x Integration 1.3.0之前版本存在加密问题漏洞，该漏洞源于构造VAU消息时request_counter未改变，导致服务器端重用AES-GCM nonce和密钥组合，可能使网络攻击者恢复明文敏感数据，还可恢复GHASH认证密钥，伪造AES-GCM消息并注入恶意响应。

CVSS 7.4 · High EPSS 0.31% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
fbeta-GmbH ePA3-Service-OpenSource < 1.3.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-50577

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ePA 3.x Integration: AES-GCM Nonce Reuse via Frozen VAU Request Counter
Source: CVE Program / CVE List V5
Vulnerability Description
ePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration leaves request_counter unchanged in app/vau/VAUProtokoll.py while constructing VAU messages. The frozen client request counter causes the server side to reuse AES-GCM nonce and key combinations across responses. A network attacker who collects repeated ciphertexts can recover the XOR of plaintexts and use predictable inner HTTP headers and JSON fields to recover sensitive data, including patient health records. Repeated nonces can also enable recovery of the GHASH authentication key through the Joux forbidden attack, allowing forged AES-GCM messages and injection of malicious responses. The response-counter check also fails to maintain last_response_counter, weakening replay and ordering validation. This issue is fixed in version 1.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5
Vulnerability Title
fbeta ePA 3.x Integration 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fbeta ePA 3.x Integration是德国fbeta公司的一款Web服务集成组件。 fbeta ePA 3.x Integration 1.3.0之前版本存在加密问题漏洞，该漏洞源于构造VAU消息时request_counter未改变，导致服务器端重用AES-GCM nonce和密钥组合，可能使网络攻击者恢复明文敏感数据，还可恢复GHASH认证密钥，伪造AES-GCM消息并注入恶意响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fbeta-GmbH ePA3-Service-OpenSource < 1.3.0 -

II. Public POCs for CVE-2026-50577

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8029 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-50577

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-50577 (2)

Vendor Advisories for CVE-2026-50577 (1)

News Coverage for CVE-2026-50577 (1)

Other References for CVE-2026-50577 (1)

Same Patch Batch · fbeta-GmbH · 2026-08-18 · 4 CVEs total

CVE-2026-52723 9.1 CRITICAL ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust
CVE-2026-50578 7.5 HIGH ePA 3.x Integration: TLS Certificate Verification Universally Disabled
CVE-2026-50576 6.8 MEDIUM ePA 3.x Integration: HTTP Header Injection in VAU Inner Requests

IV. Related Vulnerabilities

Same product: ePA3-Service-OpenSource
Same vendor: fbeta-GmbH
Same weakness: CWE-323

V. Comments for CVE-2026-50577

No comments yet

Leave a comment