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Vulnerabilities/CVE-2023-2868Public Intelligence Dossier
Source: barracuda · Limited verification•Last verified: •Collection Degraded
CVE-2023-2868ListedCRITICAL (raw)CVSS 9.8CWE-20

A remote command injection vulnerability exists in the Barracuda Email Security Gateway (appliance form factor only) product effecting versions 5.1.3.001-9.2.0.006

Published: 25 May 2023•Last updated: 17 Jun 2026, 11:23 AM IST•Source identifier: cve-coordination@google.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added26 May 2023
Due16 Jun 2023
RansomwareUnknown
CVSS score
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
86.8%0.868
Percentile100th
Weakness type
CWE-20
CWE-77
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A remote command injection vulnerability exists in the Barracuda Email Security Gateway (appliance form factor only) product effecting versions 5.1.3.001-9.2.0.006. The vulnerability arises out of a failure to comprehensively sanitize the processing of .tar file (tape archives). The vulnerability stems from incomplete input validation of a user-supplied .tar file as it pertains to the names of the files contained within the archive. As a consequence, a remote attacker can specifically format these file names in a particular manner that will result in remotely executing a system command through Perl's qx operator with the privileges of the Email Security Gateway product. This issue was fixed as part of BNSF-36456 patch. This patch was automatically applied to all customer appliances.

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; CRITICAL severity; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

5 source-backed products
Affected products and versions (source)
  • barracuda email security gateway 300 firmware · >= 5.1.3.001 <= 9.2.0.006 · NVD CPE · Source
  • barracuda email security gateway 400 firmware · >= 5.1.3.001 <= 9.2.0.006 · NVD CPE · Source
  • barracuda email security gateway 600 firmware · >= 5.1.3.001 <= 9.2.0.006 · NVD CPE · Source
  • barracuda email security gateway 800 firmware · >= 5.1.3.001 <= 9.2.0.006 · NVD CPE · Source
  • barracuda email security gateway 900 firmware · >= 5.1.3.001 <= 9.2.0.006 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:barracuda:email_security_gateway_300:-:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_400:-:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_600:-:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_800:-:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_900:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: Apply updates per vendor instructions.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: Apply updates per vendor instructions.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
26 May 2023
Required action due
16 Jun 2023
Known ransomware use
Unknown

Apply updates per vendor instructions.

Change History & Source Data

— No recorded material change

CNA / source
cve-coordination@google.com
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:barracuda:email_security_gateway_300_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_300:-:*:*:*:*:*:*:*, cpe:2.3:o:barracuda:email_security_gateway_400_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_400:-:*:*:*:*:*:*:*, cpe:2.3:o:barracuda:email_security_gateway_600_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_600:-:*:*:*:*:*:*:*, cpe:2.3:o:barracuda:email_security_gateway_800_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_800:-:*:*:*:*:*:*:*, cpe:2.3:o:barracuda:email_security_gateway_900_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:barracuda:email_security_gateway_900:-:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2023-05-26status.barracuda.comSource recordnvd.nist.govSource recordbarracuda.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2023-2868
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2023-2868
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2023-2868"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.