CVE-2019-1010251: Open Information Security Foundation Suricata prior to version 4.1.2 is affected by: Denial of Service - DNS d

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2019-1010251 is a high-severity flaw (CVSS 7.5) affecting suricata. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open Information Security Foundation Suricata prior to version 4.1.2 is affected by: Denial of Service - DNS detection bypass. The impact is: An attacker can evade a signature detection with a specialy formed network packet. The component is: app-layer-detect-proto.c, decode.c, decode-teredo.c and decode-ipv6.c (https://github.com/OISF/suricata/pull/3590/commits/11f3659f64a4e42e90cb3c09fcef66894205aefe, https://github.com/OISF/suricata/pull/3590/

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-07-18
Last modified	2026-06-17

Publisher (CNA): DWF · Vendor: oisf

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-18 18:15 UTCPublished CVE record published
2026-06-17 02:09 UTCUpdated Record last modified

oisf suricata DOWNGRADE

Affected: 4.0.2 · 4.0.3 · 4.0.5 · 4.1.0 beta1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.2

1. Check installed version

apt-cache policy suricata || rpm -q suricata || suricata --version

2. No fixed release: DOWNGRADE to a release before 4.0.2 (Debian / Ubuntu)

apt-cache madison suricata sudo apt install suricata=<VERSION_BEFORE_4.0.2> sudo apt-mark hold suricata

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list suricata sudo dnf downgrade suricata-<VERSION_BEFORE_4.0.2> sudo dnf versionlock add suricata

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-1010251?

suricata: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-1010251 being exploited?

CVE-2019-1010251 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-1010251 affect?

CVE-2019-1010251 affects suricata. Severity is high (CVSS 7.5). Open Information Security Foundation Suricata prior to version 4.1.2 is affected by: Denial of Service - DNS detection bypass. The impact is: An attacker can evade a signature detection with a specialy formed network packet. The component i

How urgent is CVE-2019-1010251?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities · Suricata and Snort vulnerabilities

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References

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