CVE-2015-1337: Simple Streams (simplestreams) does not properly verify the GPG signatures of disk image files, which allows r

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MEDIUM 6.8WATCHLISTMITIGATEMITIGATE

CVE-2015-1337 is a medium-severity flaw (CVSS 6.8) affecting simplestreams, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Simple Streams (simplestreams) does not properly verify the GPG signatures of disk image files, which allows remote mirror servers to spoof disk images and have unspecified other impact via a 403 (aka Forbidden) response.

Why this priority

Public exploit reference
On your watchlist

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-20
Published	2015-10-09
Last modified	2026-06-17

Publisher (CNA): Canonical Ltd. · Vendor: canonical · simpestreams project

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

Am I affected?

Timeline

2015-10-09 14:59 UTCPublished CVE record published
2026-06-17 00:22 UTCUpdated Record last modified

simpestreams project simplestreams MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

canonical ubuntu linux MITIGATE

Affected: 14.04 · 15.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2015-1337?

simplestreams: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-1337 being exploited?

CVE-2015-1337 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-2015-1337 affect?

CVE-2015-1337 affects simplestreams, ubuntu linux. Severity is medium (CVSS 6.8). Simple Streams (simplestreams) does not properly verify the GPG signatures of disk image files, which allows remote mirror servers to spoof disk images and have unspecified other impact via a 403 (aka Forbidden) response.

How urgent is CVE-2015-1337?

Priority 53/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities

References

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