CVE-2025-57785: A Double Free in XSLT `show_index` has been identified in Hiawatha webserver version 11.7 which allows an unau

Routine

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-57785 is a medium-severity flaw (CVSS 6.5) affecting hiawatha webserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Double Free in XSLT `show_index` has been identified in Hiawatha webserver version 11.7 which allows an unauthenticated attacker to corrupt data which may lead to arbitrary code execution.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-415
Published	2026-01-26
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: hiawatha.leisink

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

Am I affected?

Timeline

2026-01-26 18:16 UTCPublished CVE record published
2026-06-17 09:43 UTCUpdated Record last modified

hiawatha.leisink hiawatha webserver DOWNGRADE

Affected: 11.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.7

1. Check installed version

apt-cache policy hiawatha-webserver || rpm -q hiawatha-webserver || hiawatha-webserver --version

2. No fixed release: DOWNGRADE to a release before 11.7 (Debian / Ubuntu)

apt-cache madison hiawatha-webserver sudo apt install hiawatha-webserver=<VERSION_BEFORE_11.7> sudo apt-mark hold hiawatha-webserver

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

dnf --showduplicates list hiawatha-webserver sudo dnf downgrade hiawatha-webserver-<VERSION_BEFORE_11.7> sudo dnf versionlock add hiawatha-webserver

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-2025-57785?

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

Is CVE-2025-57785 being exploited?

CVE-2025-57785 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-2025-57785 affect?

CVE-2025-57785 affects hiawatha webserver. Severity is medium (CVSS 6.5). A Double Free in XSLT `show_index` has been identified in Hiawatha webserver version 11.7 which allows an unauthenticated attacker to corrupt data which may lead to arbitrary code execution.

How urgent is CVE-2025-57785?

Priority 36/100. Remotely exploitable, no login, no user action

References

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