How severe is CVE-2018-1635?

CVE-2018-1635 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1635 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1635?

CVE-2018-1635 primarily affects Ibm Informix Dynamic Server. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-1635?

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

When was CVE-2018-1635 published?

CVE-2018-1635 was published on 2019-08-20 and last updated on 2026-06-17.

CVE-2018-1635

CVE-2018-1635 is a medium-severity vulnerability in Ibm Informix Dynamic Server with a CVSS 3.x base score of 6.7. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
CVSS v2: 7.2
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Ibm Informix Dynamic Server
Published: 2019-08-20
Last modified: 2026-06-17

Description

Stack-based buffer overflow in oninit in IBM Informix Dynamic Server Enterprise Edition 12.1 allows an authenticated user to execute predefined code with root privileges, such as escalating to a root shell. IBM X-Force ID: 144439.

Frequently asked questions

What is CVE-2018-1635?: Stack-based buffer overflow in oninit in IBM Informix Dynamic Server Enterprise Edition 12.1 allows an authenticated user to execute predefined code with root privileges, such as escalating to a root shell. IBM X-Force ID: 144439.
How severe is CVE-2018-1635?: CVE-2018-1635 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1635 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1635?: CVE-2018-1635 primarily affects Ibm Informix Dynamic Server. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-1635?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-1635 published?: CVE-2018-1635 was published on 2019-08-20 and last updated on 2026-06-17.

References

Affected products (12)

cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc1:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc10:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc11:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc12:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc2:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc3:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc4:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc5:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc6:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc7:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc8:*:*:enterprise:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:12.10:fc9:*:*:enterprise:*:*:*

More vulnerabilities in Ibm Informix Dynamic Server

CVE-2010-4070 — Critical (CVSS 10.0): Integer overflow in librpc.dll in portmap.exe (aka the ISM Portmapper service) in ISM before 2.20.TC1.117 in IBM…
CVE-2009-2754 — Critical (CVSS 10.0): Integer signedness error in the authentication functionality in librpc.dll in the Informix Storage Manager (ISM)…
CVE-2009-2753 — Critical (CVSS 10.0): Multiple buffer overflows in the authentication functionality in librpc.dll in the Informix Storage Manager (ISM)…
CVE-2008-0949 — Critical (CVSS 10.0): Unspecified vulnerability in IBM Informix Dynamic Server (IDS) 7.x through 11.x allows remote attackers to gain…
CVE-2008-0768 — Critical (CVSS 10.0): Multiple stack-based and heap-based buffer overflows in the Windows RPC components for IBM Informix Storage Manager…
CVE-2011-1033 — Critical (CVSS 9.3): Stack-based buffer overflow in oninit in IBM Informix Dynamic Server (IDS) 11.50 allows remote attackers to execute…

All CVEs affecting Ibm Informix Dynamic Server →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →