How severe is CVE-2025-35434?

CVE-2025-35434 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-35434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-35434?

CVE-2025-35434 affects Cisa Thorium. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-35434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-35434 have an EU (EUVD) identifier?

Yes. CVE-2025-35434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29734.

When was CVE-2025-35434 published?

CVE-2025-35434 was published on 2025-09-17 and last updated on 2026-06-17.

CVE-2025-35434

CVE-2025-35434 is a medium-severity vulnerability in Cisa Thorium with a CVSS 3.x base score of 4.2. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
CVSS v4: 2.3
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-29734
Weakness: CWE-295
Affected product: Cisa Thorium
Published: 2025-09-17
Last modified: 2026-06-17

Description

CISA Thorium does not validate TLS certificates when connecting to Elasticsearch. An unauthenticated attacker with access to a Thorium cluster could impersonate the Elasticsearch service. Fixed in 1.1.2.

Frequently asked questions

What is CVE-2025-35434?: CISA Thorium does not validate TLS certificates when connecting to Elasticsearch. An unauthenticated attacker with access to a Thorium cluster could impersonate the Elasticsearch service. Fixed in 1.1.2.
How severe is CVE-2025-35434?: CVE-2025-35434 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-35434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-35434?: CVE-2025-35434 affects Cisa Thorium. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-35434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-35434 have an EU (EUVD) identifier?: Yes. CVE-2025-35434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-29734.
When was CVE-2025-35434 published?: CVE-2025-35434 was published on 2025-09-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisa:thorium:*:*:*:*:*:*:*:*

More vulnerabilities in Cisa Thorium

CVE-2025-35431 — Medium (CVSS 5.4): CISA Thorium does not escape user controlled strings used in LDAP queries. An authenticated remote attacker can modify…
CVE-2025-35436 — Medium (CVSS 5.3): CISA Thorium uses '.unwrap()' to handle errors related to account verification email messages. An unauthenticated…
CVE-2025-35432 — Medium (CVSS 5.3): CISA Thorium does not rate limit requests to send account verification email messages. A remote unauthenticated…
CVE-2025-35433 — Medium (CVSS 5.0): CISA Thorium does not properly invalidate previously used tokens when resetting passwords. An attacker that possesses a…
CVE-2025-35430 — Medium (CVSS 5.0): CISA Thorium does not adequately validate the paths of downloaded files via 'download_ephemeral' and…
CVE-2025-35435 — Medium (CVSS 4.3): CISA Thorium accepts a stream split size of zero then divides by this value. A remote, authenticated attacker could…

All CVEs affecting Cisa Thorium →

Other CWE-295 (Improper Certificate Validation) vulnerabilities

CVE-2026-4370 — Critical (CVSS 10.0): A vulnerability was identified in Juju from version 3.2.0 until 3.6.19 and from version 4.0 until 4.0.4, where the…
CVE-2026-30836 — Critical (CVSS 10.0): Step CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6…
CVE-2025-68121 — Critical (CVSS 10.0): During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between…
CVE-2022-20703 — Critical (CVSS 10.0): Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker…
CVE-2021-1471 — Critical (CVSS 9.9): Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms…
CVE-2026-20184 — Critical (CVSS 9.8): A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed…

Browse all CWE-295 (Improper Certificate Validation) vulnerabilities →