How severe is CVE-2023-25950?

CVE-2023-25950 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2023-25950 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-25950?

CVE-2023-25950 primarily affects Haproxy. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-25950?

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-2023-25950 published?

CVE-2023-25950 was published on 2023-04-11 and last updated on 2026-06-17.

CVE-2023-25950

CVE-2023-25950 is a high-severity vulnerability in Haproxy with a CVSS 3.x base score of 7.3. 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-444.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Haproxy
Published: 2023-04-11
Last modified: 2026-06-17

Description

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.

Frequently asked questions

What is CVE-2023-25950?: HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.
How severe is CVE-2023-25950?: CVE-2023-25950 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2023-25950 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-25950?: CVE-2023-25950 primarily affects Haproxy. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-25950?: 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-2023-25950 published?: CVE-2023-25950 was published on 2023-04-11 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
cpe:2.3:a:haproxy:haproxy:2.7.0:*:*:*:*:*:*:*

More vulnerabilities in Haproxy

CVE-2019-19330 — Critical (CVSS 9.8): The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII…
CVE-2023-25725 — Critical (CVSS 9.1): HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some…
CVE-2020-11100 — High (CVSS 8.8): In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can…
CVE-2023-45539 — High (CVSS 8.2): HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive…
CVE-2026-55204 — High (CVSS 7.5): HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in…
CVE-2026-55203 — High (CVSS 7.5): HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's…

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CVE-2025-55315 — Critical (CVSS 9.9): Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized…
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