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Description
When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration.
Basic information
Type
reviewed
Severity
high Advisory on GitHub
Open advisory ↗ Repository advisory
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Source code
Not specified Published (advisory)
2023-07-05 19:12:51 UTC
Updated
2025-08-13 14:56:13 UTC
GitHub reviewed
2023-07-05 20:26:48 UTC
NVD published
2023-06-09
EPSS Score
Score
Percentile
0.07%
22.55%
CVSS Scores
Base score
Version
Severity
Vector
7.4
3.1
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CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
CWEs
CWE id
Name
CWE-440
Expected Behavior Violation
Credits
jmatosgrafana
(analyst)
picatz
(analyst)
jonasfj
(analyst)
tal-sealsecurity
(analyst)
Affected packages (6)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
maven
io.grpc:grpc-protobuf >= 1.53.0, < 1.53.1
1.53.1
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pip
grpcio >= 1.53.0, < 1.53.1
1.53.1
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rubygems
grpc >= 1.53.0, < 1.53.1
1.53.1
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pip
grpcio >= 1.54.0, < 1.54.2
1.54.2
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rubygems
grpc >= 1.54.0, < 1.54.2
1.54.2
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maven
io.grpc:grpc-protobuf >= 1.54.0, < 1.54.2
1.54.2
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cvelogic
Threat Intelligence