What is CVE-2013-2174?

CVE-2013-2174 is a vulnerability in Haxx Curl, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2013-07-31.

Is CVE-2013-2174 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Haxx Curl

CVE-2013-2174

Heap-based buffer overflow in the curl_easy_unescape function in lib/escape.c in cURL and libcurl 7.7 through 7.30.0 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted string ending in a "%" (percent) character.

Vulnerability class: Buffer Overflow

Published 2013-07-31 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 6.8 (Medium). Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.107 (95.7th percentile), scored 2026-10-01.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.111 · newest: 0.107 · change: -0.004

Affected products

Haxx Curl — versions 7.7, 7.7.1, 7.7.2
Haxx Libcurl — versions 7.7, 7.7.1, 7.7.2
Canonical Ubuntu Linux — versions 10.04, 12.04, 12.10
openSUSE — versions 11.4
Red Hat Enterprise Linux — versions 5, 6.0

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
lists.opensuse.org/opensuse-updates/2013-07/msg00013.html (vendor-advisory)
rhn.redhat.com/errata/RHSA-2013-0983.html (vendor-advisory)
github.com/bagder/curl/commit/192c4f788d48f82c03e9cef40013f34370e90737 (Exploit, Patch)
www.securityfocus.com/bid/60737 (vdb-entry)
www.ubuntu.com/usn/USN-1894-1 (vendor-advisory)
www.debian.org/security/2013/dsa-2713 (vendor-advisory)
curl.haxx.se/docs/adv_20130622.html (Vendor Advisory)

Frequently asked questions

What is CVE-2013-2174?: CVE-2013-2174 is a vulnerability in Haxx Curl, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2013-07-31.
Is CVE-2013-2174 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.