No exploitation reportedFix available

CVE-2013-1753

Q: Is CVE-2013-1753 actively exploited?

Active exploitation of CVE-2013-1753 has not been confirmed. Its EPSS score was 3.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2013-1753?

CVE-2013-1753 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2020-03-11
Fixed in3.4.3 · 3.3.6 · 3.2.6 · 2.7.9

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The gzip_decode function in the xmlrpc client library in Python 3.4 and earlier allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP request.

Timeline

dates in UTC

2020-03-1117:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2013-1753?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2013-1753?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Python

Branch	Affected	Fixed in	Source
3.4	≥ 3.4.0, < 3.4.3	3.4.3	NVD
3.3	≥ 3.3.0, < 3.3.6	3.3.6	NVD
3.2	≥ 3.2.0, < 3.2.6	3.2.6	NVD
2.7	≥ 2.7.0, < 2.7.9	2.7.9	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Python to 3.4.3 · 3.3.6 · 3.2.6 · 2.7.9

Advisories and patches

bugs.python.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
FIRST EPSSEPSS score3.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2020-03-11
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2013-1753?

The gzip_decode function in the xmlrpc client library in Python 3.4 and earlier allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP request.

Is CVE-2013-1753 actively exploited?

Active exploitation of CVE-2013-1753 has not been confirmed. Its EPSS score was 3.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2013-1753?

CVE-2013-1753 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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