CVE-2025-54472: Apache bRPC: Redis Parser Remote Denial of Service

[Wang Weibing <wwbmmm () apache org>]

Severity: important 

Affected versions:

- Apache bRPC before 1.14.1

Description:

Unlimited memory allocation in redis protocol parser in Apache bRPC (all versions < 1.14.1) on all platforms allows 
attackers to crash the service via network.



Root Cause: In the bRPC Redis protocol parser code, memory for arrays or strings of corresponding sizes is allocated 
based on the integers read from the network. If the integer read from the network is too large, it may cause a bad 
alloc error and lead to the program crashing. Attackers can exploit this feature by sending special data packets to the 
bRPC service to carry out a denial-of-service attack on it.
The bRPC 1.14.0 version tried to fix this issue by limited the memory allocation size, however, the limitation checking 
code is not well implemented that may cause integer overflow and evade such limitation. So the 1.14.0 version is also 
vulnerable, although the integer range that affect version 1.14.0 is different from that affect version < 1.14.0.



Affected scenarios: Using bRPC as a Redis server to provide network services to untrusted clients, or using bRPC as a 
Redis client to call untrusted Redis services.



How to Fix: we provide two methods, you can choose one of them:

1. Upgrade bRPC to version 1.14.1.
2. Apply this patch ( https://github.com/apache/brpc/pull/3050 ) manually.

No matter you choose which method, you should note that the patch limits the maximum length of memory allocated for 
each time in the bRPC Redis parser. The default limit is 64M. If some of you redis request or response have a size 
larger than 64M, you might encounter error after upgrade. For such case, you can modify the gflag 
redis_max_allocation_size to set a larger limit.

Credit:

Tyler Zars (reporter)

References:

https://brpc.apache.org
https://www.cve.org/CVERecord?id=CVE-2025-54472