CVE-2016-2515: Hawk before 3.1.3 and 4.x before 4.1.1 allow remote attackers to cause a denial of service (CPU consumption or

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2016-2515 is a high-severity flaw (CVSS 7.5) affecting hawk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hawk before 3.1.3 and 4.x before 4.1.1 allow remote attackers to cause a denial of service (CPU consumption or partial outage) via a long (1) header or (2) URI that is matched against an improper regular expression.

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	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-399
Published	2016-04-13
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: hawk project

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

Am I affected?

Timeline

2016-04-13 16:59 UTCPublished CVE record published
2026-06-17 00:44 UTCUpdated Record last modified

hawk project hawk DOWNGRADE

Affected: 3.1.2 · 4.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1.2 (Debian / Ubuntu)

apt-cache madison hawk sudo apt install hawk=<VERSION_BEFORE_3.1.2> sudo apt-mark hold hawk

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

dnf --showduplicates list hawk sudo dnf downgrade hawk-<VERSION_BEFORE_3.1.2> sudo dnf versionlock add hawk

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-2016-2515?

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

Is CVE-2016-2515 being exploited?

CVE-2016-2515 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-2016-2515 affect?

CVE-2016-2515 affects hawk. Severity is high (CVSS 7.5). Hawk before 3.1.3 and 4.x before 4.1.1 allow remote attackers to cause a denial of service (CPU consumption or partial outage) via a long (1) header or (2) URI that is matched against an improper regular expression.

How urgent is CVE-2016-2515?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26219 HIGH 7.4 UPGRADE UPGRADE The Hawk Console and Hawk Agent components of TIBCO Software Inc.'s TIBCO Hawk, TIBCO Hawk Distribution for TI
CVE-2022-41564 MEDIUM 6.8 UPGRADE UPGRADE The Hawk Console component of TIBCO Software Inc.'s TIBCO Hawk and TIBCO Operational Intelligence Hawk RedTail
CVE-2022-29167 HIGH 7.4 UPGRADE Hawk is an HTTP authentication scheme providing mechanisms for making authenticated HTTP requests with partial
CVE-2021-3020 HIGH 8.8 UPGRADE An issue was discovered in ClusterLabs Hawk (aka HA Web Konsole) through 2.3.0-15
CVE-2020-35458 CRITICAL 9.8 DOWNGRADE An issue was discovered in ClusterLabs Hawk 2.x through 2.3.0-x

References

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