CWE-340
Generation of Predictable Numbers or Identifiers
The product uses a scheme that generates numbers or identifiers that are more predictable than required.
CVE-2025-3449 (GCVE-0-2025-3449)
Vulnerability from cvelistv5 – Published: 2025-10-07 18:21 – Updated: 2025-10-08 13:15
VLAI
Title
Weak Session Token used in Automation Runtime SDM
Summary
A Generation of Predictable Numbers or Identifiers vulnerability in the SDM component of B&R Automation Runtime versions before 6.4 may allow an unauthenticated network-based attacker to take over already established sessions.
Severity
CWE
- CWE-340 - Generation of Predictable Numbers or Identifiers
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| B&R Industrial Automation GmbH | Automation Runtime |
Affected:
6.0 , < 6.4
(custom)
Affected: 4 (custom) |
Date Public
2025-10-07 00:30
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CVE-2025-40918 (GCVE-0-2025-40918)
Vulnerability from cvelistv5 – Published: 2025-07-16 14:00 – Updated: 2025-11-04 21:10
VLAI
Title
Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely
Summary
Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely.
The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
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depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy.
Severity
6.5 (Medium)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| EHUELS | Authen::SASL::Perl::DIGEST_MD5 |
Affected:
2.04 , ≤ 2.1800
(custom)
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CVE-2025-40919 (GCVE-0-2025-40919)
Vulnerability from cvelistv5 – Published: 2025-07-16 14:04 – Updated: 2025-07-16 20:49
VLAI
Title
Authen::DigestMD5 versions 0.01 through 0.04 for Perl generate the cnonce insecurely
Summary
Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate the cnonce insecurely.
The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
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Severity
6.5 (Medium)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SALVA | Authen::DigestMD5 |
Affected:
0.01 , ≤ 0.04
(custom)
|
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CVE-2025-40920 (GCVE-0-2025-40920)
Vulnerability from cvelistv5 – Published: 2025-08-11 20:19 – Updated: 2026-01-17 20:23
VLAI
Title
Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl use insecurely generated nonces
Summary
Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl generate nonces using the Perl Data::UUID library.
* Data::UUID does not use a strong cryptographic source for generating UUIDs.
* Data::UUID returns v3 UUIDs, which are generated from known information and are unsuitable for security, as per RFC 9562.
* The nonces should be generated from a strong cryptographic source, as per RFC 7616.
Severity
8.6 (High)
CWE
Assigner
References
6 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ETHER | Catalyst::Authentication::Credential::HTTP |
Affected:
0.06 , ≤ 1.018
(custom)
|
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CVE-2025-40923 (GCVE-0-2025-40923)
Vulnerability from cvelistv5 – Published: 2025-07-16 13:05 – Updated: 2025-11-04 21:10
VLAI
Title
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely
Summary
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely.
The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
Predicable session ids could allow an attacker to gain access to systems.
Severity
7.3 (High)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MIYAGAWA | Plack::Middleware::Session |
Affected:
0.01 , < 0.35
(custom)
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CVE-2025-40924 (GCVE-0-2025-40924)
Vulnerability from cvelistv5 – Published: 2025-07-17 13:33 – Updated: 2025-07-17 19:53
VLAI
Title
Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely
Summary
Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely.
The session id is generated from a (usually SHA-1) hash of a simple counter, the epoch time, the built-in rand function, the PID and the current Catalyst context. This information is of low entropy. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
Predicable session ids could allow an attacker to gain access to systems.
Severity
6.5 (Medium)
CWE
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HAARG | Catalyst::Plugin::Session |
Affected:
0.01 , < 0.44
(custom)
|
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CVE-2025-40925 (GCVE-0-2025-40925)
Vulnerability from cvelistv5 – Published: 2025-09-20 12:31 – Updated: 2025-09-22 17:27
VLAI
Title
Starch versions 0.14 and earlier generate session ids insecurely
Summary
Starch versions 0.14 and earlier generate session ids insecurely.
The default session id generator returns a SHA-1 hash seeded with a counter, the epoch time, the built-in rand function, the PID, and internal Perl reference addresses. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
Predicable session ids could allow an attacker to gain access to systems.
Severity
9.1 (Critical)
CWE
Assigner
References
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CVE-2025-40926 (GCVE-0-2025-40926)
Vulnerability from cvelistv5 – Published: 2026-03-05 01:24 – Updated: 2026-04-21 02:42
VLAI
Title
Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely
Summary
Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely.
The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.
Predictable session ids could allow an attacker to gain access to systems.
Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.
Severity
9.8 (Critical)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://metacpan.org/release/KAZEBURO/Plack-Middl… | |
| https://github.com/kazeburo/Plack-Middleware-Sess… | issue-tracking |
| https://github.com/kazeburo/Plack-Middleware-Sess… | patch |
| https://www.cve.org/CVERecord?id=CVE-2025-40923 | vendor-advisoryrelatedvdb-entry |
| https://security.metacpan.org/docs/guides/random-… | technical-description |
| https://metacpan.org/release/KAZEBURO/Plack-Middl… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| KAZEBURO | Plack::Middleware::Session::Simple |
Affected:
0 , < 0.05
(custom)
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CVE-2025-40931 (GCVE-0-2025-40931)
Vulnerability from cvelistv5 – Published: 2026-03-05 01:41 – Updated: 2026-04-21 02:42
VLAI
Title
Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id
Summary
Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id.
Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.
Note that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom.
Severity
9.1 (Critical)
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://metacpan.org/dist/Apache-Session/source/l… | |
| https://security.metacpan.org/docs/guides/random-… | technical-description |
| https://github.com/chorny/Apache-Session/issues/4 | issue-tracking |
| https://rt.cpan.org/Ticket/Display.html?id=173631 | issue-tracking |
| https://www.openwall.com/lists/oss-security/2019/… | mailing-list |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug… | issue-tracking |
| https://salsa.debian.org/perl-team/modules/packag… | patch |
| https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/… | issue-tracking |
| https://metacpan.org/pod/Apache::Session::Generat… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| CHORNY | Apache::Session::Generate::MD5 |
Affected:
0 , ≤ 1.94
(custom)
|
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CVE-2025-40932 (GCVE-0-2025-40932)
Vulnerability from cvelistv5 – Published: 2026-02-26 23:33 – Updated: 2026-02-27 18:41
VLAI
Title
Apache::SessionX versions through 2.01 for Perl create insecure session id
Summary
Apache::SessionX versions through 2.01 for Perl create insecure session id.
Apache::SessionX generates session ids insecurely. The default session id generator in Apache::SessionX::Generate::MD5 returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.
Severity
8.2 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://metacpan.org/release/GRICHTER/Apache-Sess… | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| GRICHTER | Apache::SessionX |
Affected:
0 , ≤ 2.01
(custom)
|
Credits
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.