KEV Intelligence

Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2016-5312

Messaging Gateway Path Traversal

Symantec / Messaging Gateway

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Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
53.7%
First observed
21 Jun 2026
Last observed
19 Jul 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2016-5312 is a vulnerability affecting Symantec Messaging Gateway. Directory traversal vulnerability in the charting component in Symantec Messaging Gateway before 10.6.2 allows remote authenticated users to read...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Symantec / Messaging Gateway.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Messaging Gateway Path Traversal

Directory traversal vulnerability in the charting component in Symantec Messaging Gateway before 10.6.2 allows remote authenticated users to read arbitrary files via a ..

(dot dot) in the sn parameter to brightmail/servlet/com.ve.kavachart.servlet.ChartStream.

Published
14 Apr 2017
Exploited Since
21 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
Low
User interaction
None

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Shadowserver

Recorded 15 Aug 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 21 Jun 2026

First-party sensor telemetry confirms matching exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
The Shadowserver First 2026-08-15 00:00 UTC
KEV Intelligence 2026-08-16 16:35 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

0

Attempts observed

0

Unique attacker IPs

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Attacker countries

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Sensors observed

Exploitation attempts over the last 61 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

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1
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1
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4
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0
0
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1
0
0
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20 Jun 3 Jul 16 Jul 29 Jul 19 Aug

First observed 21 Jun 2026 · Last observed 19 Jul 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.0

6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

53.7%

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE-22

All CVSS Scores

CVSS v3.0 6.5 Medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 4.0 Medium

AV:N/AC:L/Au:S/C:P/I:N/A:N

Timeline

From disclosure to observed exploitation

  1. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  2. Observed by KEV Intelligence sensors

    Evidence-backed exploitation signal

  3. Indicators of compromise added (4)

    Indicators of compromise recorded

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2016-5312

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2016-5312",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": 0.53702,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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