VulnerabilityPublished 1 Jul 2025

CVE-2025-49489: ASR Falcon_Linux、Kestrel、Lapwing_Linux · Improper Resource Shutdown or Release

Affects ASR Falcon_Linux、Kestrel、Lapwing_LinuxSource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

5.4Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 1 Jul 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
ASR Falcon_Linux、Kestrel、Lapwing_Linux	Affected =0	Fixed in–

AI-suggested

Organizations should prioritize upgrading affected ASR products to version 1536 or later once patches become available. Until patches are released, administrators should monitor resource usage closely on systems running Falcon_Linux, Kestrel, or Lapwing_Linux, especially focusing on memory, file descriptors, and network sockets to detect abnormal accumulation. Implement strict access controls and privilege management to reduce the risk of exploitation, as the vulnerability requires privileged access. Employ system and application-level monitoring and alerting to detect early signs of resource exhaustion or performance degradation. Consider deploying resource limits (e.g., cgroups or ulimit on Linux) to contain potential leaks. Conduct regular audits of system logs and resource usage metrics. If possible, isolate vulnerable components in segmented network zones to limit impact. Engage with ASR support channels for early access to patches or workarounds and verify the integrity of updates before deployment.

Description

Improper Resource Shutdown or Release vulnerability in ASR Falcon_Linux、Kestrel、Lapwing_Linux on Linux (con_mgr components) allows Resource Leak Exposure. This vulnerability is associated with program files con_mgr/dialer_task.C. This issue affects Falcon_Linux、Kestrel、Lapwing_Linux: before v1536.

Impact

For European organizations using ASR Falcon_Linux, Kestrel, or Lapwing_Linux, this vulnerability could lead to degraded system performance or availability issues due to resource leaks. Over time, unclosed resources may accumulate, causing denial of service conditions or system instability. This is particularly critical for organizations relying on these products in production environments, such as telecommunications, industrial control systems, or critical infrastructure where ASR products may be deployed. The slight confidentiality impact suggests some limited exposure of sensitive information might occur, though the primary concern is availability degradation. European entities with high availability requirements or those operating in regulated sectors (e.g., finance, healthcare, energy) could face operational disruptions or compliance challenges if this vulnerability is exploited or triggers failures. Since exploitation requires privileges, insider threats or compromised accounts could leverage this vulnerability to degrade system reliability.

CWE-404Improper Resource Shutdown or Release (opens in a new tab)
Class weaknessLikelihood of exploit: Medium
The product does not release or incorrectly releases a resource before it is made available for re-use.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation
It is good practice to be responsible for freeing all resources you allocate and to be consistent with how and where you free memory in a function. If you allocate memory that you intend to free upon completion of the function, you must be sure to free the memory at all exit points for that function including error…
Implementation
Memory should be allocated/freed using matching functions such as malloc/free, new/delete, and new[]/delete[].
Attack patterns
TCP Fragmentation (opens in a new tab)
UDP Fragmentation (opens in a new tab)
ICMP Fragmentation (opens in a new tab)
BlueSmacking (opens in a new tab)
Flooding (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

asrmicro.com/en/goods/psirt?cid=40 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 1 Jul 2025, 10:09 UTC

WeaknessesCWE-404

Technical details

References

Community reviews

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