CVE-2020-3138

Privileged code execution via insufficient upgrade signature validation

Published Feb 19, 2020 · Updated Nov 15, 2024

Improper signature verification in Cisco NFVIS 3.11.1 and earlier allows local users to execute crafted code through an upgrade file. The upgrade component accepts a crafted image without adequately validating its cryptographic signature, allowing unauthorized code to be installed. Exploitation requires highly privileged local access and an upgrade operation, after which the crafted code runs on the affected device.

CVSS severity6.7
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Cisco NFVIS 3.11.1 and earlier allows local users to execute crafted code through an upgrade file. The upgrade component accepts a crafted image without adequately validating its cryptographic signature, allowing unauthorized code to be installed. Exploitation requires highly privileged local access and an upgrade operation, after which the crafted code runs on the affected device.

The record

CVE
CVE-2020-3138
Published
Feb 19, 2020
Updated
Nov 15, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-347
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
6.7Cisco Systems, Inc.CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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