How severe is CVE-2020-25657?

CVE-2020-25657 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-25657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25657?

CVE-2020-25657 primarily affects Redhat Virtualization. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-25657?

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

When was CVE-2020-25657 published?

CVE-2020-25657 was published on 2021-01-12 and last updated on 2026-06-17.

CVE-2020-25657

CVE-2020-25657 is a medium-severity vulnerability in Redhat Virtualization with a CVSS 3.x base score of 5.9. 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-385.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-385
Affected product: Redhat Virtualization
Published: 2021-01-12
Last modified: 2026-06-17

Description

A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.

Frequently asked questions

What is CVE-2020-25657?: A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.
How severe is CVE-2020-25657?: CVE-2020-25657 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-25657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25657?: CVE-2020-25657 primarily affects Redhat Virtualization. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-25657?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-25657 published?: CVE-2020-25657 was published on 2021-01-12 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1889823

Affected products (5)

cpe:2.3:a:m2crypto_project:m2crypto:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

More vulnerabilities in Redhat Virtualization

CVE-2015-0235 — Critical (CVSS 10.0): Heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc 2.2, and other 2.x versions before 2.18,…
CVE-2019-10126 — Critical (CVSS 9.8): A flaw was found in the Linux kernel. A heap based buffer overflow in mwifiex_uap_parse_tail_ies function in…
CVE-2019-3888 — Critical (CVSS 9.8): A vulnerability was found in Undertow web server before 2.0.21. An information exposure of plain text credentials…
CVE-2019-10160 — Critical (CVSS 9.8): A security regression of CVE-2019-9636 was discovered in python since commit d537ab0ff9767ef024f26246899728f0116b1ec3…
CVE-2019-9636 — Critical (CVSS 9.8): Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an…
CVE-2018-17963 — Critical (CVSS 9.8): qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause…

All CVEs affecting Redhat Virtualization →

Other CWE-385 vulnerabilities

CVE-2026-5598 — High (CVSS 7.5): Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This…
CVE-2025-59425 — High (CVSS 7.5): vLLM is an inference and serving engine for large language models (LLMs). Before version 0.11.0rc2, the API key support…
CVE-2020-25658 — High (CVSS 7.5): It was found that python-rsa is vulnerable to Bleichenbacher timing attacks. An attacker can use this flaw via the RSA…
CVE-2025-0306 — High (CVSS 7.4): A vulnerability was found in Ruby. The Ruby interpreter is vulnerable to the Marvin Attack. This attack allows the…
CVE-2023-46809 — High (CVSS 7.4): Node.js versions which bundle an unpatched version of OpenSSL or run against a dynamically linked version of OpenSSL…
CVE-2023-3640 — High (CVSS 7.0): A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to…

Browse all CWE-385 vulnerabilities →