CVE-2013-2303: Sleipnir 4.0.0.4000 and earlier on Windows allows remote attackers to spoof the SSL lock icon and address-bar

Q: How do I fix CVE-2013-2303?

sleipnir: upgrade to newer than 4.0.0.4000. Exact commands for each OS are on this page.

Q: Is CVE-2013-2303 being exploited?

CVE-2013-2303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2013-2303 affect?

CVE-2013-2303 affects sleipnir. Severity is medium (CVSS 5.0). Sleipnir 4.0.0.4000 and earlier on Windows allows remote attackers to spoof the SSL lock icon and address-bar colors via unspecified vectors.

Q: How urgent is CVE-2013-2303?

Priority 33/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2013-2303 is a medium-severity flaw (CVSS 5.0) affecting sleipnir. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sleipnir 4.0.0.4000 and earlier on Windows allows remote attackers to spoof the SSL lock icon and address-bar colors via unspecified vectors.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Published	2013-04-16
Last modified	2026-06-16

Publisher (CNA): JPCERT/CC · Vendor: fenrir-inc

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

Am I affected?

Timeline

2013-04-16 14:04 UTCPublished CVE record published
2026-06-16 23:53 UTCUpdated Record last modified

fenrir-inc sleipnir UPGRADE

Affected: <= 4.0.0.4000 · 3.9.1.4000

Fixed in: newer than 4.0.0.4000

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.0.0.4000 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sleipnir

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sleipnir

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2013-2303?

sleipnir: upgrade to newer than 4.0.0.4000. Exact commands for each OS are on this page.

Is CVE-2013-2303 being exploited?

CVE-2013-2303 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-2013-2303 affect?

CVE-2013-2303 affects sleipnir. Severity is medium (CVSS 5.0). Sleipnir 4.0.0.4000 and earlier on Windows allows remote attackers to spoof the SSL lock icon and address-bar colors via unspecified vectors.

How urgent is CVE-2013-2303?

Priority 33/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities

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References

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