CVE-2017-12965: Session fixation vulnerability in Apache2Triad 1.5.4 allows remote attackers to hijack web sessions via the PH

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CRITICAL 9.8REMOTEWATCHLISTDOWNGRADE

CVE-2017-12965 is a critical-severity flaw (CVSS 9.8) affecting apache2triad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Session fixation vulnerability in Apache2Triad 1.5.4 allows remote attackers to hijack web sessions via the PHPSESSID parameter.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	15.7% (top 3%)
CISA exploited list	No
Weakness	CWE-384
Published	2017-08-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: apache2triad

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

Am I affected?

Timeline

2017-08-23 16:29 UTCPublished CVE record published
2026-06-17 01:04 UTCUpdated Record last modified

apache2triad apache2triad DOWNGRADE

Affected: 1.5.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.4

1. Check installed version

apt-cache policy apache2triad || rpm -q apache2triad || apache2triad --version

2. No fixed release: DOWNGRADE to a release before 1.5.4 (Debian / Ubuntu)

apt-cache madison apache2triad sudo apt install apache2triad=<VERSION_BEFORE_1.5.4> sudo apt-mark hold apache2triad

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

dnf --showduplicates list apache2triad sudo dnf downgrade apache2triad-<VERSION_BEFORE_1.5.4> sudo dnf versionlock add apache2triad

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · root · FIXED · 6.40.04-7.fc46 · FEDORA-2026-7329868400 · source

sudo dnf upgrade --advisory=FEDORA-2026-7329868400

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.exploit-db.com/exploits/42520/
Exploit-DB: Apache2Triad 1.5.4 - Multiple Vulnerabilities

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-2017-12965?

apache2triad: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-12965 being exploited?

CVE-2017-12965 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-2017-12965 affect?

CVE-2017-12965 affects apache2triad. Severity is critical (CVSS 9.8). Session fixation vulnerability in Apache2Triad 1.5.4 allows remote attackers to hijack web sessions via the PHPSESSID parameter.

How urgent is CVE-2017-12965?

Priority 74/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2017-12971 MEDIUM 6.1 DOWNGRADE Cross-site scripting (XSS) vulnerability in Apache2Triad 1.5.4 allows remote attackers to inject arbitrary web
CVE-2017-12970 HIGH 8.8 DOWNGRADE Cross-site request forgery (CSRF) vulnerability in Apache2Triad 1.5.4 allows remote attackers to hijack the au

References

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