VulnerabilityPublished 26 Dec 2025

CVE-2025-1721: IBM Concert · Heap Inspection

Affects IBM ConcertSource CVE Database V5

Not known to be exploited · CVSS 5.9 Medium.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

5.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
IBM Concert	Affected =1.0.0	Fixed in–

AI-suggested

Monitor IBM’s official channels closely for the release of security patches addressing CVE-2025-1721 and apply them promptly once available.
Restrict network access to IBM Concert services by implementing strict firewall rules and network segmentation to limit exposure to trusted internal networks only.
Employ memory protection mechanisms such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) to reduce the risk of memory-based attacks.
Conduct regular security audits and memory analysis to detect anomalous access patterns or memory leaks that could indicate exploitation attempts.
Use encryption for sensitive data in transit and at rest to minimize the impact of potential data leakage.
Educate IT and security teams about this vulnerability to ensure rapid response and monitoring.
Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics tuned to detect suspicious activity related to IBM Concert.
Limit the use of IBM Concert to essential personnel and services until the vulnerability is resolved to reduce attack surface.

Description

IBM Concert 1.0.0 through 2.1.0 could allow a remote attacker to obtain sensitive information from allocated memory due to improper clearing of heap memory.

Impact

For European organizations, the primary impact of CVE-2025-1721 is the potential unauthorized disclosure of sensitive information due to residual data in heap memory. This can lead to breaches of confidentiality, exposing intellectual property, personal data, or credentials. Such exposure can result in regulatory penalties under GDPR if personal data is compromised. The vulnerability does not affect system integrity or availability, so operational disruption is unlikely. However, the confidentiality breach risk is significant for sectors like finance, healthcare, government, and critical infrastructure that rely on IBM Concert for secure communication and collaboration. Attackers exploiting this vulnerability could gain access to sensitive internal communications or credentials, facilitating further attacks such as lateral movement or privilege escalation. The high attack complexity somewhat limits widespread exploitation, but targeted attacks against high-value European organizations remain a concern. The absence of patches increases the window of exposure, emphasizing the need for proactive mitigation.

CWE-244Improper Clearing of Heap Memory Before Release ('Heap Inspection') (opens in a new tab)
Variant weakness
Using realloc() to resize buffers that store sensitive information can leave the sensitive information exposed to attack, because it is not removed from memory.
OWASP ASVS 4.0.3
V8.3.2 (opens in a new tab)
V8.3.6 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

ibm.com/support/pages/node/7255549 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Dec 2025, 13:30 UTC

WeaknessesCWE-244

Technical details

References

Community reviews

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