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CVE-2011-0633

18
FAUCET Score

CVE-2011-0633 describes a vulnerability in the Net::HTTPS module of libwww-perl (LWP) versions prior to 6.00, affecting products like WWW::Mechanize and LWP::UserAgent. This flaw allows remote attackers to spoof servers through man-in-the-middle (MITM) attacks due to insufficient SSL certificate validation, specifically when the If-SSL-Cert-Subject header is not set. The vulnerability carries a CVSS score of 4.3 (Medium), indicating a network-based attack with medium complexity and potential for partial integrity impact (data spoofing). There is no confidentiality or availability impact. Currently, there is no evidence of active exploitation, nor are there any public exploit codes available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are minimal, consistent with the majority of reported vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
0.01CPE matchmatch criteria
cpe:2.3:a:gisle_aas:libwww-perl:0.01:*:*:*:*:*:*:*
0.02CPE matchmatch criteria
cpe:2.3:a:gisle_aas:libwww-perl:0.02:*:*:*:*:*:*:*
0.03CPE matchmatch criteria
cpe:2.3:a:gisle_aas:libwww-perl:0.03:*:*:*:*:*:*:*
0.04CPE matchmatch criteria
cpe:2.3:a:gisle_aas:libwww-perl:0.04:*:*:*:*:*:*:*
5.00CPE matchmatch criteria
cpe:2.3:a:gisle_aas:libwww-perl:5.00:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.25%
Probability of exploitation in next 30 days
EPSS Percentile
90.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0425 is in the 87th percentile among its peer group of 19,955 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: perl-libwww-perl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: perl-libwww-perl
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: perl-libwww-perl

Vendor Advisories (1)

redhatCVE-2011-0633Moderate

perl-libwww-perl: no hostname check against SSL certificate name by default

Mar 8, 2011

References

cpansearch.perl.org / src/GAAS/libwww-perl-6.02/Changes
vttynotes.blogspot.com / 2010/12/man-in-middle-fun-with-perl-lwp.html
vttynotes.blogspot.com / 2011/03/quick-note-on-lwp-and-perl-security-cve.html