CVE-2019-5613Network attack vector

Repeated actions via missing IPsec replay check

Published Feb 18, 2020 · Updated Aug 4, 2024

Packet replay in FreeBSD 12.0-RELEASE before 12.0-RELEASE-p13 allows man-in-the-middle attackers to repeat actions over IPsec. The kernel IPsec packet processor omits the anti-replay-window check, so it accepts and processes a previously captured packet again. Exploitation requires the ability to capture and inject IPsec traffic, and the repeated effect depends on the higher-level protocol in use.

CVSS severity9.8
Critical
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Packet replay in FreeBSD 12.0-RELEASE before 12.0-RELEASE-p13 allows man-in-the-middle attackers to repeat actions over IPsec. The kernel IPsec packet processor omits the anti-replay-window check, so it accepts and processes a previously captured packet again. Exploitation requires the ability to capture and inject IPsec traffic, and the repeated effect depends on the higher-level protocol in use.

The record

CVE
CVE-2019-5613
Published
Feb 18, 2020
Updated
Aug 4, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-345, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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

  1. Affected versionversion=12.0 before 12.0-RELEASE-p13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=12.0 before 12.0-RELEASE-p13

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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