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CVE-2013-7338

23
FAUCET Score

CVE-2013-7338 is a denial-of-service vulnerability affecting Python versions before 3.3.4 RC1, including Apple's macOS implementations. Attackers can trigger an infinite loop and high CPU consumption by providing a crafted zip file with a size value exceeding the actual file size to various ZipExtFile and ZipFile functions. With a CVSS score of 7.1, this vulnerability is considered high severity, requiring medium attack complexity and leading to complete availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.3.0:-:*:*:*:*:*:*
3.3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.3.0:alpha1:*:*:*:*:*:*
3.3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.3.0:alpha2:*:*:*:*:*:*
3.3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.3.0:alpha3:*:*:*:*:*:*
3.3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.3.0:alpha4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.1HIGH

AV:N/AC:M/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.05%
Probability of exploitation in next 30 days
EPSS Percentile
91.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0505 is in the 59th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

applepatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: python33-python

Vendor Advisories (1)

redhatCVE-2013-7338Moderate

python: malformed ZIP files could cause 100% CPU usage

Dec 27, 2013

References

bugs.python.org / issue20078
ExploitPatchVendor Advisory
hg.python.org / cpython/rev/79ea4ce431b1
ExploitPatchVendor Advisory
lists.apple.com / archives/security-announce/2015/Aug/msg00001.html
Mailing List
lists.opensuse.org / opensuse-updates/2014-05/msg00008.html
Mailing ListThird Party Advisory
docs.python.org / 3.3/whatsnew/changelog.html
Vendor Advisory
seclists.org / oss-sec/2014/q1/592
Mailing ListThird Party Advisory
seclists.org / oss-sec/2014/q1/595
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201503-10
Third Party Advisory
support.apple.com / kb/HT205031
PatchVendor Advisory
securityfocus.com / bid/65179
Third Party AdvisoryVDB Entry
securitytracker.com / id/1029973
Third Party AdvisoryVDB Entry