How severe is CVE-2001-1537?

CVE-2001-1537 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2001-1537 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1537?

CVE-2001-1537 affects Symfony Twig. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1537?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-1537 published?

CVE-2001-1537 was published on 2001-12-31 and last updated on 2026-06-16.

CVE-2001-1537

CVE-2001-1537 is a high-severity vulnerability in Symfony Twig with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-312.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-312
Affected product: Symfony Twig
Published: 2001-12-31
Last modified: 2026-06-16

Description

The default "basic" security setting' in config.php for TWIG webmail 2.7.4 and earlier stores cleartext usernames and passwords in cookies, which could allow attackers to obtain authentication information and gain privileges.

Frequently asked questions

What is CVE-2001-1537?: The default "basic" security setting' in config.php for TWIG webmail 2.7.4 and earlier stores cleartext usernames and passwords in cookies, which could allow attackers to obtain authentication information and gain privileges.
How severe is CVE-2001-1537?: CVE-2001-1537 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2001-1537 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1537?: CVE-2001-1537 affects Symfony Twig. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-1537 published?: CVE-2001-1537 was published on 2001-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:symfony:twig:*:*:*:*:*:*:*:*

More vulnerabilities in Symfony Twig

CVE-2018-13818 — Critical (CVSS 9.8): Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key parameter. NOTE: the vendor…
CVE-2026-24425 — High (CVSS 8.8): Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface…
CVE-2022-23614 — High (CVSS 8.8): Twig is an open source template language for PHP. When in a sandbox mode, the `arrow` parameter of the `sort` filter…
CVE-2024-45411 — High (CVSS 8.5): Twig is a template language for PHP. Under some circumstances, the sandbox security checks are not run which allows…
CVE-2022-39261 — High (CVSS 7.5): Twig is a template language for PHP. Versions 1.x prior to 1.44.7, 2.x prior to 2.15.3, and 3.x prior to 3.4.3…
CVE-2015-7809 — Medium (CVSS 6.8): The displayBlock function Template.php in Sensio Labs Twig before 1.20.0, when Sandbox mode is enabled, allows remote…

All CVEs affecting Symfony Twig →

Other CWE-312 (Cleartext Storage of Sensitive Information) vulnerabilities

CVE-2022-43757 — Critical (CVSS 9.9): A Cleartext Storage of Sensitive Information vulnerability in SUSE Rancher allows users on managed clusters to gain…
CVE-2021-36782 — Critical (CVSS 9.9): A Cleartext Storage of Sensitive Information vulnerability in SUSE Rancher allows authenticated Cluster Owners, Cluster…
CVE-2020-9045 — Critical (CVSS 9.9): During installation or upgrade to Software House C•CURE 9000 v2.70 and American Dynamics victor Video Management…
CVE-2026-31848 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which…
CVE-2025-65826 — Critical (CVSS 9.8): The mobile application was found to contain stored credentials for the network it was developed on. If an attacker…
CVE-2025-34206 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) Virtual Appliance Host and Application (VA and SaaS deployments) mount host…

Browse all CWE-312 (Cleartext Storage of Sensitive Information) vulnerabilities →