CVE-2013-3300: The JsonParser class in json/JsonParser.scala in Lift before 2.5 interprets a certain end-index value as a len

Q: How do I fix CVE-2013-3300?

lift: upgrade to newer than 2.5. Exact commands for each OS are on this page.

Q: Is CVE-2013-3300 being exploited?

CVE-2013-3300 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-2013-3300 affect?

CVE-2013-3300 affects lift. Severity is medium (CVSS 4.0). The JsonParser class in json/JsonParser.scala in Lift before 2.5 interprets a certain end-index value as a length value, which allows remote authenticated users to obtain sensitive information from other users' sessions via invalid input da

Q: How urgent is CVE-2013-3300?

Priority 37/100. Public exploit reference

Routine

MEDIUM 4.0UPGRADE

CVE-2013-3300 is a medium-severity flaw (CVSS 4.0) affecting lift. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The JsonParser class in json/JsonParser.scala in Lift before 2.5 interprets a certain end-index value as a length value, which allows remote authenticated users to obtain sensitive information from other users' sessions via invalid input data containing a < (less than) character.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-119
Published	2013-07-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: liftweb

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

Am I affected?

Timeline

2013-07-29 13:59 UTCPublished CVE record published
2026-06-16 23:54 UTCUpdated Record last modified

liftweb lift UPGRADE

Affected: <= 2.5 · 2.1 · 2.2 · 2.3 · 2.4 · 2.5 m4 · 2.5 rc1 · 2.5 rc2

Fixed in: newer than 2.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lift

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-2013-3300?

lift: upgrade to newer than 2.5. Exact commands for each OS are on this page.

Is CVE-2013-3300 being exploited?

CVE-2013-3300 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-2013-3300 affect?

CVE-2013-3300 affects lift. Severity is medium (CVSS 4.0). The JsonParser class in json/JsonParser.scala in Lift before 2.5 interprets a certain end-index value as a length value, which allows remote authenticated users to obtain sensitive information from other users' sessions via invalid input da

How urgent is CVE-2013-3300?

Priority 37/100. Public exploit reference

References

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