CVE-2011-1487: The (1) lc, (2) lcfirst, (3) uc, and (4) ucfirst functions in Perl 5.10.x, 5.11.x, and 5.12.x through 5.12.3, and 5.13.x through 5.13.11, do…
Noroxi assessment
Priority: Monitor (action score 23/100)
- Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 10.5% (FIRST EPSS); higher than 95.8% of all records.
- No special conditions are required; it is repeatable.
- Fixed version: perl (Debian:12) 5.10.1-20; perl (Debian:5.0) 5.10.0-19lenny4; perl (Debian:6.0) 5.10.1-17squeeze1.
Low priority for now. Upgrade to perl (Debian:12) 5.10.1-20; perl (Debian:5.0) 5.10.0-19lenny4; perl (Debian:6.0) 5.10.1-17squeeze1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
The (1) lc, (2) lcfirst, (3) uc, and (4) ucfirst functions in Perl 5.10.x, 5.11.x, and 5.12.x through 5.12.3, and 5.13.x through 5.13.11, do not apply the taint attribute to the return value upon processing tainted input, which might allow context-dependent attackers to bypass the taint protection mechanism via a crafted string.
- Published
- Apr 11, 2011
- Updated
- Jun 16, 2026
- EPSS
- 10.5% · 95th percentile
- CWE
- CWE-264
Report tools
Action score
23
Low priority for now.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 10.5%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
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Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| perl | perl | cpe:2.3:a:perl:perl |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- perl perl5.10.0
- perl perl5.10.1
- perl perl5.11.0
- perl perl5.11.1
- perl perl5.11.2
- perl perl5.11.3
- perl perl5.11.4
- perl perl5.11.5
+12 more rows
- perl perl5.12.0
- perl perl5.12.1
- perl perl5.12.2
- perl perl5.12.3
- perl perl5.13.0
- perl perl5.13.1
- perl perl5.13.10
- perl perl5.13.11
- perl perl5.13.2
- perl perl5.13.3
- perl perl5.13.4
- perl perl5.13.5
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | perl | before 5.10.1-20 | 5.10.1-20 |
| Debian:5.0 | perl | before 5.10.0-19lenny4 | 5.10.0-19lenny4 |
| Debian:6.0 | perl | before 5.10.1-17squeeze1 | 5.10.1-17squeeze1 |
| Red Hat:enterprise_linux:6::client | perl | before 4:5.10.1-119.el6 | 4:5.10.1-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-Archive-Extract | before 1:0.38-119.el6 | 1:0.38-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-Archive-Tar | before 0:1.58-119.el6 | 0:1.58-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-CGI | before 0:3.51-119.el6 | 0:3.51-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-Compress-Raw-Zlib | before 0:2.023-119.el6 | 0:2.023-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-Compress-Zlib | before 0:2.020-119.el6 | 0:2.020-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-core | before 0:5.10.1-119.el6 | 0:5.10.1-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-CPAN | before 0:1.9402-119.el6 | 0:1.9402-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-CPANPLUS | before 0:0.88-119.el6 | 0:0.88-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-debuginfo | before 4:5.10.1-119.el6 | 4:5.10.1-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-devel | before 4:5.10.1-119.el6 | 4:5.10.1-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-Digest-SHA | before 1:5.47-119.el6 | 1:5.47-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-ExtUtils-CBuilder | before 1:0.27-119.el6 | 1:0.27-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-ExtUtils-Embed | before 0:1.28-119.el6 | 0:1.28-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-ExtUtils-MakeMaker | before 0:6.55-119.el6 | 0:6.55-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-ExtUtils-ParseXS | before 1:2.2003.0-119.el6 | 1:2.2003.0-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-File-Fetch | before 0:0.26-119.el6 | 0:0.26-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-IO-Compress-Base | before 0:2.020-119.el6 | 0:2.020-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-IO-Compress-Zlib | before 0:2.020-119.el6 | 0:2.020-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-IO-Zlib | before 1:1.09-119.el6 | 1:1.09-119.el6 |
| Red Hat:enterprise_linux:6::client | perl-IPC-Cmd | before 1:0.56-119.el6 | 1:0.56-119.el6 |
+24
Same product
perl: all recordsOther highest-scoring records for the same primary product.
- CVE-2012-6329The _compile function in Maketext.pm in the Locale::Maketext implementation in Perl before 5.17.7 does not properly handle backslashes and…49Plan
- CVE-2018-18311Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.43Plan
- CVE-2018-18312Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.43Plan
Published before and after this one in the same product
- ← EarlierCVE-2010-1158Apr 20, 2010 · Integer overflow in the regular expression engine in Perl 5.8.x allows context-dependent attackers to cause a denial of service (stack…21Monitor
- ← EarlierCVE-2010-1168Jun 21, 2010 · The Safe (aka Safe.pm) module before 2.25 for Perl allows context-dependent attackers to bypass intended (1) Safe::reval and (2) Safe::rdo…31Monitor
- Later →CVE-2011-0761May 13, 2011 · Perl 5.10.x allows context-dependent attackers to cause a denial of service (NULL pointer dereference and application crash) by leveraging…23Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:perl | 5.10.1-20 · Debian:12 | Package registry (OSV) |
| red hat:perl | 4:5.10.1-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-Archive-Extract | 1:0.38-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-Archive-Tar | 0:1.58-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-CGI | 0:3.51-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-Compress-Raw-Zlib | 0:2.023-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-Compress-Zlib | 0:2.020-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-CPAN | 0:1.9402-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-CPANPLUS | 0:0.88-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-Digest-SHA | 1:5.47-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-ExtUtils-CBuilder | 1:0.27-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-ExtUtils-Embed | 0:1.28-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:perl-ExtUtils-MakeMaker | 0:6.55-119.el6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2011-03-30 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-13 d
- Published
- TodayNov 15, 2026+5697 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Not on record for this CVE: researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- P · data or configuration can be modified
- Availability
- none
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- P
- Availability impact
- None
Weakness class (CWE)
CWE-264 · Permissions, Privileges, and Access ControlsCVSS vector
AV:N/AC:L/Au:N/C:N/I:P/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (9 more)Show less
- lists.fedoraproject.org/pipermail/package-announce/2011-April/057971.html
- lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
- perl5.git.perl.org/perl.git/commit/539689e74a3bcb04d29e4cd9396de91a81045b99
- secunia.com/advisories/43921
- secunia.com/advisories/44168
- www.debian.org/security/2011/dsa-2265
- www.mandriva.com/security/advisories?name=MDVSA-2011:091
- bugzilla.redhat.com/show_bug.cgi?id=692844
- exchange.xforce.ibmcloud.com/vulnerabilities/66528
Vendor advisories and official records. Exploit/PoC links are deliberately left out.