CVE-2024-53704Known exploitationPublic exploitNetwork attack vector

Unauthenticated session hijacking via null-byte cookie

Published Jan 9, 2025 · Updated Aug 4, 2026

Improper authentication in SonicOS SSLVPN allows remote attackers to hijack an active VPN session with a crafted session cookie. The getSslvpnSessionFromCookie routine decodes a 44-character Base64 cookie, and its session comparison treats a null byte as success instead of rejecting the mismatch. The SSLVPN service must be enabled and at least one client session active; exploitation exposes that user's VPN identity, configuration, and private routes.

CVSS severity9.8
Critical
EPSS probability95.31%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in SonicOS SSLVPN allows remote attackers to hijack an active VPN session with a crafted session cookie. The getSslvpnSessionFromCookie routine decodes a 44-character Base64 cookie, and its session comparison treats a null byte as success instead of rejecting the mismatch. The SSLVPN service must be enabled and at least one client session active; exploitation exposes that user's VPN identity, configuration, and private routes.

The record

CVE
CVE-2024-53704
Published
Jan 9, 2025
Updated
Aug 4, 2026
Vendor
SonicWall
Product
SonicOS
Classifications
CWE-287, T1563
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=7.1.1-7058 and older versions
  2. Affected versionversion=7.1.2-7019
  3. Affected versionversion=8.0.0-8035

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · SonicOSversion=7.1.1-7058 and older versions; version=7.1.2-7019; version=8.0.0-8035

Published CVSS scores

8.2CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.2SonicWallCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 20265
Sep 23, 20262
Sep 24, 20263
Sep 25, 20264
Sep 26, 202680
Sep 27, 20264
Sep 28, 20262
Latest reporting daySep 28, 2026
Latest daily unique IPs2
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1563Hijack Existing Connection

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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