CVE-2022-24834Public exploitNetwork attack vector

Authenticated code execution via truncated JSON buffer length

Published Jul 13, 2023 · Updated Feb 13, 2025

Heap overflow in affected Redis releases allows remote authenticated users to execute code through crafted Lua JSON encoding. The cJSON json_append_string function narrows its size_t length calculation to the int parameter of strbuf_ensure_empty_length, so truncation can suppress resizing before unchecked appends. An account authorized to run EVAL or EVALSHA must supply a roughly 341 MiB string; resulting heap corruption can crash Redis or enable process-level code execution.

CVSS severity7.0
High
EPSS probability41.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in affected Redis releases allows remote authenticated users to execute code through crafted Lua JSON encoding. The cJSON json_append_string function narrows its size_t length calculation to the int parameter of strbuf_ensure_empty_length, so truncation can suppress resizing before unchecked appends. An account authorized to run EVAL or EVALSHA must supply a roughly 341 MiB string; resulting heap corruption can crash Redis or enable process-level code execution.

The record

CVE
CVE-2022-24834
Published
Jul 13, 2023
Updated
Feb 13, 2025
Vendor
Redis
Product
Redis
Classifications
CWE-122, CWE-680, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.0.0, < 6.0.20
  2. Affected versionversion=6.0.0 <6.0.20
  3. Affected versionversion=>= 6.2.0, < 6.2.13
  4. Affected versionversion=6.2.0 <6.2.13
  5. Affected versionversion=>= 7.0.0, < 7.0.12
  6. Affected versionversion=7.0.0 <7.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Redis · Redisversion=>= 6.0.0, < 6.0.20; version=6.0.0 <6.0.20; version=>= 6.2.0, < 6.2.13; version=6.2.0 <6.2.13; version=>= 7.0.0, < 7.0.12; version=7.0.0 <7.0.12

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-680Integer Overflow to Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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