CVE-2023-6337 | Vault May be Vulnerable to a Denial of Service Through Memory Exhaustion When Handling Large HTTP Requests

HashiCorp Vault and Vault Enterprise 1.12.0 and newer are vulnerable to a denial of service through memory exhaustion of the host when handling large unauthenticated and authenticated HTTP requests from a client. Vault will attempt to map the request to memory, resulting in the exhaustion of available memory on the host, which may cause Vault to crash. Fixed in Vault 1.15.4, 1.14.8, 1.13.12.

Published: 2023-12-08 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-6337 is rated Moderate Risk (47.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.80%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-6337

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.00% 0.80% -0.20%
2 2025-12-28 0.88% 1.00% +0.12%
3 2025-12-27 — 0.88% —

Full EPSS history (28 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-6337

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:N)
Doesn’t really leak secrets in a meaningful 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.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:N)
Doesn’t really leak secrets in a meaningful 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.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-6337

GitHub Security Advisory for CVE-2023-6337

GHSA-6p62-6cg9-f5f5 · Severity: high · Ecosystem: go — Memory exhaustion in HashiCorp Vault

OS Trackers for CVE-2023-6337

vendor priority summary link
alpine — CVE-2023-6337: 1 source package rows (vault); 11 state rows across 1 repos (edge-community); fixed 0, open 11. https://security.alpinelinux.org/vuln/CVE-2023-6337
redhat medium — https://access.redhat.com/security/cve/CVE-2023-6337

Affected software / configurations for CVE-2023-6337

Vendor Product Version Raw CPE
hashicorp vault <= 1.12.0 cpe:2.3:a:hashicorp:vault:*:*:*:*:*:*:*:*
hashicorp vault <= 1.12.0 cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*
hashicorp vault >= 1.13.0, < 1.13.12 cpe:2.3:a:hashicorp:vault:*:*:*:*:*:*:*:*
hashicorp vault >= 1.13.0, < 1.13.12 cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*
hashicorp vault >= 1.14.0, < 1.14.8 cpe:2.3:a:hashicorp:vault:*:*:*:*:*:*:*:*
hashicorp vault >= 1.14.0, < 1.14.8 cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*
hashicorp vault >= 1.15.0, < 1.15.4 cpe:2.3:a:hashicorp:vault:*:*:*:*:*:*:*:*
hashicorp vault >= 1.15.0, < 1.15.4 cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*

References for CVE-2023-6337

cvelogic Threat Intelligence