CVE-2001-0748: Acme.Serve 1.7, as used in Cisco Secure ACS Unix and possibly other products, allows remote attackers to read

This week

MEDIUM 5.0DOWNGRADE

CVE-2001-0748 is a medium-severity flaw (CVSS 5.0) affecting acme server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Acme.Serve 1.7, as used in Cisco Secure ACS Unix and possibly other products, allows remote attackers to read arbitrary files by prepending several / (slash) characters to the URI.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	9.2% (top 5%)
CISA exploited list	No
Weakness	CWE-20
Published	2001-10-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: acme labs

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2001-10-18 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

acme labs acme server DOWNGRADE

Affected: 1.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7

1. Check installed version

apt-cache policy acme-server || rpm -q acme-server || acme-server --version

2. No fixed release: DOWNGRADE to a release before 1.7 (Debian / Ubuntu)

apt-cache madison acme-server sudo apt install acme-server=<VERSION_BEFORE_1.7> sudo apt-mark hold acme-server

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

dnf --showduplicates list acme-server sudo dnf downgrade acme-server-<VERSION_BEFORE_1.7> sudo dnf versionlock add acme-server

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.

Public exploits and detection

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

Exploit-DB: Acme.Serve 1.7 - Arbitrary File Access

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-2001-0748?

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

Is CVE-2001-0748 being exploited?

CVE-2001-0748 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-2001-0748 affect?

CVE-2001-0748 affects acme server. Severity is medium (CVSS 5.0). Acme.Serve 1.7, as used in Cisco Secure ACS Unix and possibly other products, allows remote attackers to read arbitrary files by prepending several / (slash) characters to the URI.

How urgent is CVE-2001-0748?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

Software pages

Cisco vulnerabilities

References

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